86661198 ÷ 640 
We're looking to find how many times 640 goes into 86661198.

Going ahead to step 1:
When dividing 8 by 640, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 640

Let's proceed to step 2:
86 divided by 640 is 0 with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Fetch the next digit (6) from the dividend, attach it to 86 and continue: 866 / 640

Let's proceed to step 3:
866 divided by 640 is 1 with a remainder of 226.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 640 from 866 to get 226.
Include the next digit (6) from the dividend after 226, then repeat: 2266 / 640

Advancing to step 4:
The number 640 fits into 2266 3 times, leaving a remainder of 346.
Write down 3 as next digit of the result. 
Result so far: 13.0
Subtract 1920 from 2266 to get 346.
Take the next digit (1) from the dividend and append it to 346, then repeat: 3461 / 640

Let's proceed to step 5:
When dividing 3461 by 640, we get 5 with a remainder of 261.
Put 5 as the next digit of the answer. 
Result so far: 135.0
Subtract 3200 from 3461 to get 261.
Take the next digit (1) from the dividend and append it to 261, then repeat: 2611 / 640

Let's proceed to step 6:
2611 divided by 640 is 4 with a remainder of 51.
Use 4 as the next digit of our solution. 
Result so far: 1354.0
If we subtract 2560 from 2611, we get 51.
Bring next digit (9) of the dividend behind the 51 and repeat the process: 519 / 640

Going ahead to step 7:
640 can be fit into 519 0 times, resulting in a remainder of 519.
Record the quotient 0 as the next digit in the result. 
Result so far: 13540.0
If we subtract 0 from 519, we get 519.
Take the next digit (8) from the dividend and append it to 519, then repeat: 5198 / 640

On to step 8:
When dividing 5198 by 640, we get 8 with a remainder of 78.
Write down 8 as next digit of the result. 
Result so far: 135408.0
Subtracting 5120 from 5198 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 9:
780 divided by 640 is 1 with a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 135408.1
Subtract 640 from 780 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 10:
640 can be fit into 1400 2 times, resulting in a remainder of 120.
The number 2 becomes the next digit in our result. 
Result so far: 135408.12
If we subtract 1280 from 1400, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 11:
When dividing 1200 by 640, we get 1 with a remainder of 560.
Record the quotient 1 as the next digit in the result. 
Result so far: 135408.121
The remainder is 560 after subtracting 640 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Advancing to step 12:
If we divide 5600 by 640, we get 8 and a remainder of 480.
Put 8 as the next digit of the answer. 
Result so far: 135408.1218
The remainder is 480 after subtracting 5120 from 5600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Step 13:
640 goes into 4800 7 times with a remainder of 320.
The next digit of our result is 7. 
Result so far: 135408.12187
Deduct 4480 from 4800 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 14:
640 goes into 3200 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 135408.121875
Subtract 3200 from 3200 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 15:
640 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 135408.121875
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 16:
640 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 135408.121875
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 135408.121875, with a leftover of 0.0.