We're dividing 86686631 by 561 
We want to figure out the number of times 86686631 can be divided by 561.

Going ahead to step 1:
If we divide 8 by 561, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 561

Step 2:
When dividing 86 by 561, we get 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Append the next digit (6) from the dividend to 86 and continue with: 866 / 561

Advancing to step 3:
If we divide 866 by 561, we get 1 and a remainder of 305.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 561 from 866, we get 305.
Include the next digit (8) from the dividend after 305, then repeat: 3058 / 561

Moving on to step 4:
If we divide 3058 by 561, we get 5 and a remainder of 253.
Write down 5 as next digit of the result. 
Result so far: 15.0
The remainder is 253 after subtracting 2805 from 3058.
Append the next digit (6) from the dividend to 253 and continue with: 2536 / 561

On to step 5:
561 goes into 2536 4 times with a remainder of 292.
The next digit of our result is 4. 
Result so far: 154.0
The remainder is 292 after subtracting 2244 from 2536.
Include the next digit (6) from the dividend after 292, then repeat: 2926 / 561

Moving on to step 6:
2926 divided by 561 is 5 with a remainder of 121.
Write down 5 as next digit of the result. 
Result so far: 1545.0
Subtract 2805 from 2926 to get 121.
Bring next digit (3) of the dividend behind the 121 and repeat the process: 1213 / 561

Going ahead to step 7:
When dividing 1213 by 561, we get 2 with a remainder of 91.
Use 2 as the next digit of our solution. 
Result so far: 15452.0
If we take 1122 away from 1213, we end up with 91.
Take the next digit (1) from the dividend and append it to 91, then repeat: 911 / 561

On to step 8:
If we divide 911 by 561, we get 1 and a remainder of 350.
The number 1 becomes the next digit in our result. 
Result so far: 154521.0
If we subtract 561 from 911, we get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Let's proceed to step 9:
If we divide 3500 by 561, we get 6 and a remainder of 134.
The number 6 becomes the next digit in our result. 
Result so far: 154521.6
Deduct 3366 from 3500 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.

Advancing to step 10:
When dividing 1340 by 561, we get 2 with a remainder of 218.
Put 2 as the next digit of the answer. 
Result so far: 154521.62
Subtract 1122 from 1340 to get 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Moving on to step 11:
The number 561 fits into 2180 3 times, leaving a remainder of 497.
The next digit of our result is 3. 
Result so far: 154521.623
If we subtract 1683 from 2180, we get 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Step 12:
If we divide 4970 by 561, we get 8 and a remainder of 482.
Write down 8 as next digit of the result. 
Result so far: 154521.6238
Subtracting 4488 from 4970 leaves us with 482.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Let's proceed to step 13:
561 can be fit into 4820 8 times, resulting in a remainder of 332.
Use 8 as the next digit of our solution. 
Result so far: 154521.62388
If we take 4488 away from 4820, we end up with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

The final outcome is 154521.62388, with a leftover of 0.000332.