89171663 divided by 66 
The aim is to understand the frequency of 66 in 89171663.

Going ahead to step 1:
When dividing 8 by 66, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 66

Going ahead to step 2:
66 goes into 89 1 times with a remainder of 23.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 66 away from 89, we end up with 23.
Fetch the next digit (1) from the dividend, attach it to 23 and continue: 231 / 66

Advancing to step 3:
66 goes into 231 3 times with a remainder of 33.
Use 3 as the next digit of our solution. 
Result so far: 13.0
The remainder is 33 after subtracting 198 from 231.
Append the next digit (7) from the dividend to 33 and continue with: 337 / 66

Step 4:
When dividing 337 by 66, we get 5 with a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 135.0
If we take 330 away from 337, we end up with 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 66

Going ahead to step 5:
When dividing 71 by 66, we get 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 1351.0
Subtracting 66 from 71 leaves us with 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 66

Let's proceed to step 6:
66 can be fit into 56 0 times, resulting in a remainder of 56.
Write down 0 as next digit of the result. 
Result so far: 13510.0
If we subtract 0 from 56, we get 56.
Bring next digit (6) of the dividend behind the 56 and repeat the process: 566 / 66

Let's proceed to step 7:
The number 66 fits into 566 8 times, leaving a remainder of 38.
Record the quotient 8 as the next digit in the result. 
Result so far: 135108.0
Subtract 528 from 566 to get 38.
Fetch the next digit (3) from the dividend, attach it to 38 and continue: 383 / 66

Advancing to step 8:
When dividing 383 by 66, we get 5 with a remainder of 53.
Write down 5 as next digit of the result. 
Result so far: 1351085.0
If we take 330 away from 383, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 9:
530 divided by 66 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1351085.8
Subtracting 528 from 530 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 10:
If we divide 20 by 66, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 1351085.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
66 goes into 200 3 times with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 1351085.803
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 12:
When dividing 20 by 66, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1351085.803
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
When dividing 200 by 66, we get 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 1351085.80303
The remainder is 2 after subtracting 198 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 14:
66 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 1351085.80303
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 15:
If we divide 200 by 66, we get 3 and a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 1351085.8030303
If we take 198 away from 200, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 16:
If we divide 20 by 66, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 1351085.8030303
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 1351085.8030303 with a remainder of 2e-08.