Let's divide 66409624 by 999
We want to figure out the number of times 66409624 can be divided by 999.

Advancing to step 1:
If we divide 6 by 999, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 999

Let's proceed to step 2:
When dividing 66 by 999, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Fetch the next digit (4) from the dividend, attach it to 66 and continue: 664 / 999

Going ahead to step 3:
When dividing 664 by 999, we get 0 with a remainder of 664.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 664 and we're left with 664.
Take the next digit (0) from the dividend and append it to 664, then repeat: 6640 / 999

On to step 4:
6640 divided by 999 is 6 with a remainder of 646.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 5994 from 6640 leaves us with 646.
Grab the next digit (9) from the dividend, add it to 646, then carry on: 6469 / 999

On to step 5:
If we divide 6469 by 999, we get 6 and a remainder of 475.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
Subtracting 5994 from 6469 leaves us with 475.
Grab the next digit (6) from the dividend, add it to 475, then carry on: 4756 / 999

Moving on to step 6:
4756 divided by 999 is 4 with a remainder of 760.
Write down 4 as next digit of the result. 
Result so far: 664.0
Subtracting 3996 from 4756 leaves us with 760.
Append the next digit (2) from the dividend to 760 and continue with: 7602 / 999

Advancing to step 7:
If we divide 7602 by 999, we get 7 and a remainder of 609.
Use 7 as the next digit of our solution. 
Result so far: 6647.0
Deduct 6993 from 7602 and we're left with 609.
Fetch the next digit (4) from the dividend, attach it to 609 and continue: 6094 / 999

Step 8:
The number 999 fits into 6094 6 times, leaving a remainder of 100.
Put 6 as the next digit of the answer. 
Result so far: 66476.0
If we take 5994 away from 6094, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 9:
1000 divided by 999 is 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 66476.1
Subtracting 999 from 1000 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 10:
10 divided by 999 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 66476.1
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 11:
100 divided by 999 is 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 66476.1
If we take 0 away from 100, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final outcome is 66476.1, with a leftover of 0.01.