66406645 ÷ 171 
The aim is to understand the frequency of 171 in 66406645.

Advancing to step 1:
When dividing 6 by 171, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 171

Going ahead to step 2:
When dividing 66 by 171, we get 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 171

Going ahead to step 3:
171 can be fit into 664 3 times, resulting in a remainder of 151.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 151 after subtracting 513 from 664.
Include the next digit (0) from the dividend after 151, then repeat: 1510 / 171

Let's proceed to step 4:
171 goes into 1510 8 times with a remainder of 142.
Write down 8 as next digit of the result. 
Result so far: 38.0
If we subtract 1368 from 1510, we get 142.
Grab the next digit (6) from the dividend, add it to 142, then carry on: 1426 / 171

Step 5:
1426 divided by 171 is 8 with a remainder of 58.
Record the quotient 8 as the next digit in the result. 
Result so far: 388.0
Deduct 1368 from 1426 and we're left with 58.
Fetch the next digit (6) from the dividend, attach it to 58 and continue: 586 / 171

Advancing to step 6:
586 divided by 171 is 3 with a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 3883.0
If we subtract 513 from 586, we get 73.
Append the next digit (4) from the dividend to 73 and continue with: 734 / 171

Step 7:
The number 171 fits into 734 4 times, leaving a remainder of 50.
Put 4 as the next digit of the answer. 
Result so far: 38834.0
Deduct 684 from 734 and we're left with 50.
Append the next digit (5) from the dividend to 50 and continue with: 505 / 171

On to step 8:
505 divided by 171 is 2 with a remainder of 163.
Write down 2 as next digit of the result. 
Result so far: 388342.0
If we subtract 342 from 505, we get 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Going ahead to step 9:
If we divide 1630 by 171, we get 9 and a remainder of 91.
The next digit of our result is 9. 
Result so far: 388342.9
Subtracting 1539 from 1630 leaves us with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Let's proceed to step 10:
When dividing 910 by 171, we get 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 388342.95
Subtracting 855 from 910 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 11:
171 goes into 550 3 times with a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 388342.953
Deduct 513 from 550 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 12:
171 can be fit into 370 2 times, resulting in a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 388342.9532
Deduct 342 from 370 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 13:
280 divided by 171 is 1 with a remainder of 109.
Put 1 as the next digit of the answer. 
Result so far: 388342.95321
If we subtract 171 from 280, we get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

On to step 14:
When dividing 1090 by 171, we get 6 with a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 388342.953216
If we take 1026 away from 1090, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 15:
171 can be fit into 640 3 times, resulting in a remainder of 127.
Use 3 as the next digit of our solution. 
Result so far: 388342.9532163
Subtract 513 from 640 to get 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 16:
171 goes into 1270 7 times with a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 388342.95321637
The remainder is 73 after subtracting 1197 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Our division results in 388342.95321637 with a remaining 7.3e-08.