We look at the division of 66478809 by 386 
The aim is to understand the frequency of 386 in 66478809.

Going ahead to step 1:
When dividing 6 by 386, we get 0 with 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.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 386

Advancing to step 2:
66 divided by 386 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Fetch the next digit (4) from the dividend, attach it to 66 and continue: 664 / 386

Let's proceed to step 3:
664 divided by 386 is 1 with a remainder of 278.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 386 from 664 to get 278.
Include the next digit (7) from the dividend after 278, then repeat: 2787 / 386

On to step 4:
When dividing 2787 by 386, we get 7 with a remainder of 85.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtracting 2702 from 2787 leaves us with 85.
Bring next digit (8) of the dividend behind the 85 and repeat the process: 858 / 386

Moving on to step 5:
858 divided by 386 is 2 with a remainder of 86.
Record the quotient 2 as the next digit in the result. 
Result so far: 172.0
Subtract 772 from 858 to get 86.
Fetch the next digit (8) from the dividend, attach it to 86 and continue: 868 / 386

On to step 6:
The number 386 fits into 868 2 times, leaving a remainder of 96.
Put 2 as the next digit of the answer. 
Result so far: 1722.0
Deduct 772 from 868 and we're left with 96.
Append the next digit (0) from the dividend to 96 and continue with: 960 / 386

Moving on to step 7:
The number 386 fits into 960 2 times, leaving a remainder of 188.
The next digit of our result is 2. 
Result so far: 17222.0
Deduct 772 from 960 and we're left with 188.
Grab the next digit (9) from the dividend, add it to 188, then carry on: 1889 / 386

Step 8:
1889 divided by 386 is 4 with a remainder of 345.
Write down 4 as next digit of the result. 
Result so far: 172224.0
If we subtract 1544 from 1889, we get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Moving on to step 9:
If we divide 3450 by 386, we get 8 and a remainder of 362.
Write down 8 as next digit of the result. 
Result so far: 172224.8
If we subtract 3088 from 3450, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

On to step 10:
386 can be fit into 3620 9 times, resulting in a remainder of 146.
Record the quotient 9 as the next digit in the result. 
Result so far: 172224.89
Subtracting 3474 from 3620 leaves us with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 11:
The number 386 fits into 1460 3 times, leaving a remainder of 302.
Record the quotient 3 as the next digit in the result. 
Result so far: 172224.893
The remainder is 302 after subtracting 1158 from 1460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Going ahead to step 12:
When dividing 3020 by 386, we get 7 with a remainder of 318.
The number 7 becomes the next digit in our result. 
Result so far: 172224.8937
The remainder is 318 after subtracting 2702 from 3020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Advancing to step 13:
The number 386 fits into 3180 8 times, leaving a remainder of 92.
Use 8 as the next digit of our solution. 
Result so far: 172224.89378
If we take 3088 away from 3180, we end up with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 14:
When dividing 920 by 386, we get 2 with a remainder of 148.
The next digit of our result is 2. 
Result so far: 172224.893782
The remainder is 148 after subtracting 772 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Advancing to step 15:
1480 divided by 386 is 3 with a remainder of 322.
The next digit of our result is 3. 
Result so far: 172224.8937823
Subtracting 1158 from 1480 leaves us with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Let's proceed to step 16:
The number 386 fits into 3220 8 times, leaving a remainder of 132.
Record the quotient 8 as the next digit in the result. 
Result so far: 172224.89378238
Deduct 3088 from 3220 and we're left with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

In conclusion, the division gives 172224.89378238 with a balance of 1.32e-07.