We look at the division of 81661421 by 515 
We want to divide 81661421 by 515.

Step 1:
515 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 515

Advancing to step 2:
515 can be fit into 81 0 times, resulting in a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Take the next digit (6) from the dividend and append it to 81, then repeat: 816 / 515

On to step 3:
The number 515 fits into 816 1 times, leaving a remainder of 301.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 515 away from 816, we end up with 301.
Include the next digit (6) from the dividend after 301, then repeat: 3016 / 515

Let's proceed to step 4:
When dividing 3016 by 515, we get 5 with a remainder of 441.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 441 after subtracting 2575 from 3016.
Take the next digit (1) from the dividend and append it to 441, then repeat: 4411 / 515

On to step 5:
When dividing 4411 by 515, we get 8 with a remainder of 291.
Record the quotient 8 as the next digit in the result. 
Result so far: 158.0
If we subtract 4120 from 4411, we get 291.
Grab the next digit (4) from the dividend, add it to 291, then carry on: 2914 / 515

Advancing to step 6:
515 goes into 2914 5 times with a remainder of 339.
Use 5 as the next digit of our solution. 
Result so far: 1585.0
If we subtract 2575 from 2914, we get 339.
Include the next digit (2) from the dividend after 339, then repeat: 3392 / 515

Going ahead to step 7:
3392 divided by 515 is 6 with a remainder of 302.
The number 6 becomes the next digit in our result. 
Result so far: 15856.0
If we subtract 3090 from 3392, we get 302.
Fetch the next digit (1) from the dividend, attach it to 302 and continue: 3021 / 515

Going ahead to step 8:
3021 divided by 515 is 5 with a remainder of 446.
Record the quotient 5 as the next digit in the result. 
Result so far: 158565.0
If we take 2575 away from 3021, we end up with 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

Step 9:
515 can be fit into 4460 8 times, resulting in a remainder of 340.
The next digit of our result is 8. 
Result so far: 158565.8
If we take 4120 away from 4460, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 10:
515 can be fit into 3400 6 times, resulting in a remainder of 310.
The next digit of our result is 6. 
Result so far: 158565.86
Subtract 3090 from 3400 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 11:
If we divide 3100 by 515, we get 6 and a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 158565.866
Subtract 3090 from 3100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 158565.866, with a leftover of 0.001.