86015915 ÷ 664 
Let's see how many times 664 fits into 86015915.

Going ahead to step 1:
664 goes into 8 0 times 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 / 664

On to step 2:
664 goes into 86 0 times with a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Take the next digit (0) from the dividend and append it to 86, then repeat: 860 / 664

Moving on to step 3:
860 divided by 664 is 1 with a remainder of 196.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 664 away from 860, we end up with 196.
Grab the next digit (1) from the dividend, add it to 196, then carry on: 1961 / 664

On to step 4:
1961 divided by 664 is 2 with a remainder of 633.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 1328 from 1961 leaves us with 633.
Bring next digit (5) of the dividend behind the 633 and repeat the process: 6335 / 664

Advancing to step 5:
6335 divided by 664 is 9 with a remainder of 359.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
If we take 5976 away from 6335, we end up with 359.
Append the next digit (9) from the dividend to 359 and continue with: 3599 / 664

Moving on to step 6:
664 goes into 3599 5 times with a remainder of 279.
Use 5 as the next digit of our solution. 
Result so far: 1295.0
Deduct 3320 from 3599 and we're left with 279.
Grab the next digit (1) from the dividend, add it to 279, then carry on: 2791 / 664

Step 7:
2791 divided by 664 is 4 with a remainder of 135.
Put 4 as the next digit of the answer. 
Result so far: 12954.0
Deduct 2656 from 2791 and we're left with 135.
Include the next digit (5) from the dividend after 135, then repeat: 1355 / 664

Going ahead to step 8:
1355 divided by 664 is 2 with a remainder of 27.
Write down 2 as next digit of the result. 
Result so far: 129542.0
If we subtract 1328 from 1355, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 9:
The number 664 fits into 270 0 times, leaving a remainder of 270.
Write down 0 as next digit of the result. 
Result so far: 129542.0
If we take 0 away from 270, we end up with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Advancing to step 10:
664 can be fit into 2700 4 times, resulting in a remainder of 44.
Record the quotient 4 as the next digit in the result. 
Result so far: 129542.04
The remainder is 44 after subtracting 2656 from 2700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 11:
664 goes into 440 0 times with a remainder of 440.
Use 0 as the next digit of our solution. 
Result so far: 129542.04
Deduct 0 from 440 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Moving on to step 12:
If we divide 4400 by 664, we get 6 and a remainder of 416.
Write down 6 as next digit of the result. 
Result so far: 129542.0406
If we subtract 3984 from 4400, we get 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Going ahead to step 13:
When dividing 4160 by 664, we get 6 with a remainder of 176.
Use 6 as the next digit of our solution. 
Result so far: 129542.04066
Subtract 3984 from 4160 to get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

The final outcome is 129542.04066, with a leftover of 0.000176.