66405693 ÷ 8 
Let's see how many times 8 fits into 66405693.

Going ahead to step 1:
If we divide 6 by 8, 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.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 8

Step 2:
8 goes into 66 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 64 from 66 and we're left with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 8

Let's proceed to step 3:
8 goes into 24 3 times with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 83.0
Deduct 24 from 24 and we're left with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 8

Moving on to step 4:
8 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 830.0
Deduct 0 from 0 and we're left with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 8

Let's proceed to step 5:
If we divide 5 by 8, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 8300.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 8

On to step 6:
56 divided by 8 is 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 83007.0
If we take 56 away from 56, we end up with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 8

Let's proceed to step 7:
8 goes into 9 1 times with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 830071.0
The remainder is 1 after subtracting 8 from 9.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 8

Going ahead to step 8:
The number 8 fits into 13 1 times, leaving a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 8300711.0
Subtract 8 from 13 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 9:
50 divided by 8 is 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 8300711.6
Deduct 48 from 50 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
When dividing 20 by 8, we get 2 with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 8300711.62
If we subtract 16 from 20, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
8 can be fit into 40 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 8300711.625
Deduct 40 from 40 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.

Advancing to step 12:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8300711.625
If we subtract 0 from 0, we 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.

Let's proceed to step 13:
If we divide 0 by 8, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8300711.625
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.

The final outcome is 8300711.625, with a leftover of 0.0.