We look at the division of 66126571 by 800 
Let's see how many times 800 fits into 66126571.

Let's proceed to step 1:
800 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
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 / 800

Step 2:
66 divided by 800 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (1) from the dividend after 66, then repeat: 661 / 800

Going ahead to step 3:
If we divide 661 by 800, we get 0 and a remainder of 661.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 661 and we're left with 661.
Grab the next digit (2) from the dividend, add it to 661, then carry on: 6612 / 800

On to step 4:
6612 divided by 800 is 8 with a remainder of 212.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 6400 from 6612 leaves us with 212.
Include the next digit (6) from the dividend after 212, then repeat: 2126 / 800

Advancing to step 5:
When dividing 2126 by 800, we get 2 with a remainder of 526.
Put 2 as the next digit of the answer. 
Result so far: 82.0
If we take 1600 away from 2126, we end up with 526.
Grab the next digit (5) from the dividend, add it to 526, then carry on: 5265 / 800

On to step 6:
When dividing 5265 by 800, we get 6 with a remainder of 465.
Record the quotient 6 as the next digit in the result. 
Result so far: 826.0
Subtract 4800 from 5265 to get 465.
Include the next digit (7) from the dividend after 465, then repeat: 4657 / 800

On to step 7:
800 goes into 4657 5 times with a remainder of 657.
The next digit of our result is 5. 
Result so far: 8265.0
If we subtract 4000 from 4657, we get 657.
Grab the next digit (1) from the dividend, add it to 657, then carry on: 6571 / 800

On to step 8:
The number 800 fits into 6571 8 times, leaving a remainder of 171.
The number 8 becomes the next digit in our result. 
Result so far: 82658.0
Subtract 6400 from 6571 to get 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Advancing to step 9:
800 goes into 1710 2 times with a remainder of 110.
The number 2 becomes the next digit in our result. 
Result so far: 82658.2
Deduct 1600 from 1710 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 10:
When dividing 1100 by 800, we get 1 with a remainder of 300.
Use 1 as the next digit of our solution. 
Result so far: 82658.21
Deduct 800 from 1100 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 11:
800 goes into 3000 3 times with a remainder of 600.
Write down 3 as next digit of the result. 
Result so far: 82658.213
The remainder is 600 after subtracting 2400 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Let's proceed to step 12:
6000 divided by 800 is 7 with a remainder of 400.
The number 7 becomes the next digit in our result. 
Result so far: 82658.2137
If we take 5600 away from 6000, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 13:
800 goes into 4000 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 82658.21375
The remainder is 0 after subtracting 4000 from 4000.
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 14:
If we divide 0 by 800, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 82658.21375
The remainder is 0 after subtracting 0 from 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 15:
If we divide 0 by 800, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 82658.21375
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 82658.21375 with a balance of 0.0.