We look at the division of 66155805 by 573 
The aim is to understand the frequency of 573 in 66155805.

On to step 1:
The number 573 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 573

Step 2:
The number 573 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Take the next digit (1) from the dividend and append it to 66, then repeat: 661 / 573

Step 3:
If we divide 661 by 573, we get 1 and a remainder of 88.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 573 from 661 leaves us with 88.
Take the next digit (5) from the dividend and append it to 88, then repeat: 885 / 573

Let's proceed to step 4:
When dividing 885 by 573, we get 1 with a remainder of 312.
Write down 1 as next digit of the result. 
Result so far: 11.0
The remainder is 312 after subtracting 573 from 885.
Fetch the next digit (5) from the dividend, attach it to 312 and continue: 3125 / 573

Moving on to step 5:
3125 divided by 573 is 5 with a remainder of 260.
Put 5 as the next digit of the answer. 
Result so far: 115.0
If we take 2865 away from 3125, we end up with 260.
Take the next digit (8) from the dividend and append it to 260, then repeat: 2608 / 573

Advancing to step 6:
573 goes into 2608 4 times with a remainder of 316.
Use 4 as the next digit of our solution. 
Result so far: 1154.0
Subtract 2292 from 2608 to get 316.
Take the next digit (0) from the dividend and append it to 316, then repeat: 3160 / 573

Advancing to step 7:
573 can be fit into 3160 5 times, resulting in a remainder of 295.
The number 5 becomes the next digit in our result. 
Result so far: 11545.0
Subtracting 2865 from 3160 leaves us with 295.
Fetch the next digit (5) from the dividend, attach it to 295 and continue: 2955 / 573

Moving on to step 8:
If we divide 2955 by 573, we get 5 and a remainder of 90.
The number 5 becomes the next digit in our result. 
Result so far: 115455.0
The remainder is 90 after subtracting 2865 from 2955.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 9:
When dividing 900 by 573, we get 1 with a remainder of 327.
Put 1 as the next digit of the answer. 
Result so far: 115455.1
The remainder is 327 after subtracting 573 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3270, and continue the process.

Let's proceed to step 10:
The number 573 fits into 3270 5 times, leaving a remainder of 405.
Use 5 as the next digit of our solution. 
Result so far: 115455.15
The remainder is 405 after subtracting 2865 from 3270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Let's proceed to step 11:
When dividing 4050 by 573, we get 7 with a remainder of 39.
Record the quotient 7 as the next digit in the result. 
Result so far: 115455.157
Subtracting 4011 from 4050 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 12:
573 goes into 390 0 times with a remainder of 390.
The next digit of our result is 0. 
Result so far: 115455.157
The remainder is 390 after subtracting 0 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Going ahead to step 13:
When dividing 3900 by 573, we get 6 with a remainder of 462.
Use 6 as the next digit of our solution. 
Result so far: 115455.15706
Subtracting 3438 from 3900 leaves us with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Going ahead to step 14:
When dividing 4620 by 573, we get 8 with a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 115455.157068
The remainder is 36 after subtracting 4584 from 4620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 15:
When dividing 360 by 573, we get 0 with a remainder of 360.
The number 0 becomes the next digit in our result. 
Result so far: 115455.157068
Subtract 0 from 360 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Let's proceed to step 16:
573 can be fit into 3600 6 times, resulting in a remainder of 162.
The next digit of our result is 6. 
Result so far: 115455.15706806
The remainder is 162 after subtracting 3438 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

The quotient of the division is 115455.15706806, and the remainder is 1.62e-07.