66039645 ÷ 40 
We want to figure out the number of times 66039645 can be divided by 40.

Going ahead to step 1:
The number 40 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 40

Going ahead to step 2:
If we divide 66 by 40, we get 1 and a remainder of 26.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 40 from 66 leaves us with 26.
Take the next digit (0) from the dividend and append it to 26, then repeat: 260 / 40

Let's proceed to step 3:
260 divided by 40 is 6 with a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 240 from 260 leaves us with 20.
Fetch the next digit (3) from the dividend, attach it to 20 and continue: 203 / 40

Going ahead to step 4:
40 can be fit into 203 5 times, resulting in a remainder of 3.
The next digit of our result is 5. 
Result so far: 165.0
Subtracting 200 from 203 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 40

Let's proceed to step 5:
40 goes into 39 0 times with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 1650.0
If we subtract 0 from 39, we get 39.
Bring next digit (6) of the dividend behind the 39 and repeat the process: 396 / 40

Advancing to step 6:
396 divided by 40 is 9 with a remainder of 36.
Put 9 as the next digit of the answer. 
Result so far: 16509.0
Subtracting 360 from 396 leaves us with 36.
Append the next digit (4) from the dividend to 36 and continue with: 364 / 40

Let's proceed to step 7:
The number 40 fits into 364 9 times, leaving a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 165099.0
Subtract 360 from 364 to get 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 40

Step 8:
If we divide 45 by 40, we get 1 and a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 1650991.0
If we subtract 40 from 45, we 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.

On to step 9:
When dividing 50 by 40, we get 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 1650991.1
Deduct 40 from 50 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
The number 40 fits into 100 2 times, leaving a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 1650991.12
Subtracting 80 from 100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
If we divide 200 by 40, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 1650991.125
The remainder is 0 after subtracting 200 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 12:
0 divided by 40 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1650991.125
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.

Moving on to step 13:
When dividing 0 by 40, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1650991.125
If we take 0 away from 0, we end up 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.

Our division results in 1650991.125 with a remaining 0.0.