We look at the division of 12555488 by 166 
The aim is to understand the frequency of 166 in 12555488.

Let's proceed to step 1:
The number 166 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 166

Going ahead to step 2:
When dividing 12 by 166, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 166

Advancing to step 3:
166 can be fit into 125 0 times, resulting in a remainder of 125.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 125 after subtracting 0 from 125.
Bring next digit (5) of the dividend behind the 125 and repeat the process: 1255 / 166

On to step 4:
The number 166 fits into 1255 7 times, leaving a remainder of 93.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 93 after subtracting 1162 from 1255.
Bring next digit (5) of the dividend behind the 93 and repeat the process: 935 / 166

On to step 5:
If we divide 935 by 166, we get 5 and a remainder of 105.
The next digit of our result is 5. 
Result so far: 75.0
If we subtract 830 from 935, we get 105.
Take the next digit (4) from the dividend and append it to 105, then repeat: 1054 / 166

Let's proceed to step 6:
166 can be fit into 1054 6 times, resulting in a remainder of 58.
The next digit of our result is 6. 
Result so far: 756.0
Subtract 996 from 1054 to get 58.
Include the next digit (8) from the dividend after 58, then repeat: 588 / 166

Going ahead to step 7:
588 divided by 166 is 3 with a remainder of 90.
Record the quotient 3 as the next digit in the result. 
Result so far: 7563.0
Subtract 498 from 588 to get 90.
Include the next digit (8) from the dividend after 90, then repeat: 908 / 166

Step 8:
When dividing 908 by 166, we get 5 with a remainder of 78.
Put 5 as the next digit of the answer. 
Result so far: 75635.0
If we take 830 away from 908, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 9:
166 goes into 780 4 times with a remainder of 116.
Put 4 as the next digit of the answer. 
Result so far: 75635.4
Subtracting 664 from 780 leaves us with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 10:
When dividing 1160 by 166, we get 6 with a remainder of 164.
The next digit of our result is 6. 
Result so far: 75635.46
If we take 996 away from 1160, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Going ahead to step 11:
166 goes into 1640 9 times with a remainder of 146.
Use 9 as the next digit of our solution. 
Result so far: 75635.469
The remainder is 146 after subtracting 1494 from 1640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Going ahead to step 12:
166 goes into 1460 8 times with a remainder of 132.
Use 8 as the next digit of our solution. 
Result so far: 75635.4698
Subtracting 1328 from 1460 leaves us 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.

Let's proceed to step 13:
When dividing 1320 by 166, we get 7 with a remainder of 158.
The next digit of our result is 7. 
Result so far: 75635.46987
Subtracting 1162 from 1320 leaves us with 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Going ahead to step 14:
The number 166 fits into 1580 9 times, leaving a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 75635.469879
If we subtract 1494 from 1580, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Going ahead to step 15:
The number 166 fits into 860 5 times, leaving a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 75635.4698795
The remainder is 30 after subtracting 830 from 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 16:
When dividing 300 by 166, we get 1 with a remainder of 134.
Write down 1 as next digit of the result. 
Result so far: 75635.46987951
Deduct 166 from 300 and we're left with 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

The quotient of the division is 75635.46987951, and the remainder is 1.34e-07.