Let's divide 66515603 by 40
We want to figure out the number of times 66515603 can be divided by 40.

Going ahead to step 1:
6 divided by 40 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 40

Going ahead to step 2:
If we divide 66 by 40, we get 1 and a remainder of 26.
The next digit of our result is 1. 
Result so far: 1.0
If we take 40 away from 66, we end up with 26.
Append the next digit (5) from the dividend to 26 and continue with: 265 / 40

Advancing to step 3:
When dividing 265 by 40, we get 6 with a remainder of 25.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
The remainder is 25 after subtracting 240 from 265.
Take the next digit (1) from the dividend and append it to 25, then repeat: 251 / 40

Advancing to step 4:
The number 40 fits into 251 6 times, leaving a remainder of 11.
Write down 6 as next digit of the result. 
Result so far: 166.0
Deduct 240 from 251 and we're left with 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 40

Advancing to step 5:
115 divided by 40 is 2 with a remainder of 35.
The number 2 becomes the next digit in our result. 
Result so far: 1662.0
Subtract 80 from 115 to get 35.
Take the next digit (6) from the dividend and append it to 35, then repeat: 356 / 40

On to step 6:
The number 40 fits into 356 8 times, leaving a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 16628.0
If we take 320 away from 356, we end up with 36.
Include the next digit (0) from the dividend after 36, then repeat: 360 / 40

Advancing to step 7:
360 divided by 40 is 9 with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 166289.0
Subtract 360 from 360 to get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 40

Moving on to step 8:
The number 40 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 1662890.0
Deduct 0 from 3 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 9:
40 can be fit into 30 0 times, resulting in a remainder of 30.
The next digit of our result is 0. 
Result so far: 1662890.0
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
The number 40 fits into 300 7 times, leaving a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 1662890.07
If we subtract 280 from 300, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 11:
200 divided by 40 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1662890.075
Subtract 200 from 200 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.

On to step 12:
40 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1662890.075
Subtract 0 from 0 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.

Going ahead to step 13:
The number 40 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1662890.075
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 1662890.075 with a balance of 0.0.