85817573 divided by 15 
Our goal is to divide 85817573 by 15.

Advancing to step 1:
8 divided by 15 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 15

Moving on to step 2:
15 can be fit into 85 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 75 away from 85, we end up with 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 15

Going ahead to step 3:
108 divided by 15 is 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 57.0
Deduct 105 from 108 and we're left with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 15

Going ahead to step 4:
If we divide 31 by 15, we get 2 and a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 572.0
Deduct 30 from 31 and we're left with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 15

Moving on to step 5:
15 can be fit into 17 1 times, resulting in a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 5721.0
Subtracting 15 from 17 leaves us with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 15

Moving on to step 6:
When dividing 25 by 15, we get 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 57211.0
Subtract 15 from 25 to get 10.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 15

Moving on to step 7:
15 can be fit into 107 7 times, resulting in a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 572117.0
Subtract 105 from 107 to get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 15

Let's proceed to step 8:
When dividing 23 by 15, we get 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 5721171.0
Subtract 15 from 23 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
When dividing 80 by 15, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 5721171.5
Subtract 75 from 80 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 10:
If we divide 50 by 15, we get 3 and a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 5721171.53
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 11:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 5721171.533
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 5721171.533 and a remainder of 0.0005.