81811537 ÷ 166 
We want to divide 81811537 by 166.

Step 1:
When dividing 8 by 166, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 166

Advancing to step 2:
166 can be fit into 81 0 times, resulting in a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Take the next digit (8) from the dividend and append it to 81, then repeat: 818 / 166

Advancing to step 3:
166 can be fit into 818 4 times, resulting in a remainder of 154.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 664 away from 818, we end up with 154.
Append the next digit (1) from the dividend to 154 and continue with: 1541 / 166

Moving on to step 4:
166 can be fit into 1541 9 times, resulting in a remainder of 47.
Use 9 as the next digit of our solution. 
Result so far: 49.0
If we take 1494 away from 1541, we end up with 47.
Bring next digit (1) of the dividend behind the 47 and repeat the process: 471 / 166

Moving on to step 5:
When dividing 471 by 166, we get 2 with a remainder of 139.
The next digit of our result is 2. 
Result so far: 492.0
If we take 332 away from 471, we end up with 139.
Include the next digit (5) from the dividend after 139, then repeat: 1395 / 166

Going ahead to step 6:
166 can be fit into 1395 8 times, resulting in a remainder of 67.
Write down 8 as next digit of the result. 
Result so far: 4928.0
The remainder is 67 after subtracting 1328 from 1395.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 166

On to step 7:
The number 166 fits into 673 4 times, leaving a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 49284.0
Subtract 664 from 673 to get 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 166

Going ahead to step 8:
97 divided by 166 is 0 with a remainder of 97.
Write down 0 as next digit of the result. 
Result so far: 492840.0
If we take 0 away from 97, we end up with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Going ahead to step 9:
The number 166 fits into 970 5 times, leaving a remainder of 140.
The number 5 becomes the next digit in our result. 
Result so far: 492840.5
Subtracting 830 from 970 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 10:
When dividing 1400 by 166, we get 8 with a remainder of 72.
The next digit of our result is 8. 
Result so far: 492840.58
Subtracting 1328 from 1400 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 11:
If we divide 720 by 166, we get 4 and a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 492840.584
Subtracting 664 from 720 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 12:
166 goes into 560 3 times with a remainder of 62.
The number 3 becomes the next digit in our result. 
Result so far: 492840.5843
Subtracting 498 from 560 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 13:
166 goes into 620 3 times with a remainder of 122.
Record the quotient 3 as the next digit in the result. 
Result so far: 492840.58433
If we subtract 498 from 620, we get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

The final result is 492840.58433 with a remainder of 0.000122.