81725755 divided by 666 
The aim is to understand the frequency of 666 in 81725755.

On to step 1:
If we divide 8 by 666, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 666

Going ahead to step 2:
666 can be fit into 81 0 times, resulting in a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Append the next digit (7) from the dividend to 81 and continue with: 817 / 666

Moving on to step 3:
If we divide 817 by 666, we get 1 and a remainder of 151.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 666 from 817 and we're left with 151.
Grab the next digit (2) from the dividend, add it to 151, then carry on: 1512 / 666

Moving on to step 4:
If we divide 1512 by 666, we get 2 and a remainder of 180.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 180 after subtracting 1332 from 1512.
Include the next digit (5) from the dividend after 180, then repeat: 1805 / 666

Advancing to step 5:
If we divide 1805 by 666, we get 2 and a remainder of 473.
Record the quotient 2 as the next digit in the result. 
Result so far: 122.0
Subtracting 1332 from 1805 leaves us with 473.
Grab the next digit (7) from the dividend, add it to 473, then carry on: 4737 / 666

Advancing to step 6:
4737 divided by 666 is 7 with a remainder of 75.
The next digit of our result is 7. 
Result so far: 1227.0
If we take 4662 away from 4737, we end up with 75.
Take the next digit (5) from the dividend and append it to 75, then repeat: 755 / 666

Step 7:
When dividing 755 by 666, we get 1 with a remainder of 89.
Use 1 as the next digit of our solution. 
Result so far: 12271.0
If we take 666 away from 755, we end up with 89.
Grab the next digit (5) from the dividend, add it to 89, then carry on: 895 / 666

Advancing to step 8:
The number 666 fits into 895 1 times, leaving a remainder of 229.
Write down 1 as next digit of the result. 
Result so far: 122711.0
Deduct 666 from 895 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Let's proceed to step 9:
When dividing 2290 by 666, we get 3 with a remainder of 292.
Put 3 as the next digit of the answer. 
Result so far: 122711.3
If we subtract 1998 from 2290, we get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Moving on to step 10:
If we divide 2920 by 666, we get 4 and a remainder of 256.
Use 4 as the next digit of our solution. 
Result so far: 122711.34
Deduct 2664 from 2920 and we're left with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Moving on to step 11:
666 goes into 2560 3 times with a remainder of 562.
Write down 3 as next digit of the result. 
Result so far: 122711.343
If we take 1998 away from 2560, we end up with 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

On to step 12:
If we divide 5620 by 666, we get 8 and a remainder of 292.
The next digit of our result is 8. 
Result so far: 122711.3438
Subtracting 5328 from 5620 leaves us with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Going ahead to step 13:
666 goes into 2920 4 times with a remainder of 256.
Put 4 as the next digit of the answer. 
Result so far: 122711.34384
If we subtract 2664 from 2920, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Let's proceed to step 14:
The number 666 fits into 2560 3 times, leaving a remainder of 562.
The number 3 becomes the next digit in our result. 
Result so far: 122711.343843
Subtracting 1998 from 2560 leaves us with 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

On to step 15:
666 can be fit into 5620 8 times, resulting in a remainder of 292.
Write down 8 as next digit of the result. 
Result so far: 122711.3438438
Deduct 5328 from 5620 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Going ahead to step 16:
If we divide 2920 by 666, we get 4 and a remainder of 256.
Write down 4 as next digit of the result. 
Result so far: 122711.34384384
If we take 2664 away from 2920, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

The final outcome is 122711.34384384, with a leftover of 2.56e-07.