66571215 ÷ 317 
We want to figure out the number of times 66571215 can be divided by 317.

Advancing to step 1:
317 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 317

Moving on to step 2:
If we divide 66 by 317, we get 0 and 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.
Bring next digit (5) of the dividend behind the 66 and repeat the process: 665 / 317

Step 3:
317 goes into 665 2 times with a remainder of 31.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 634 from 665, we get 31.
Append the next digit (7) from the dividend to 31 and continue with: 317 / 317

Advancing to step 4:
The number 317 fits into 317 1 times, leaving a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
The remainder is 0 after subtracting 317 from 317.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 317

Step 5:
317 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 210.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 317

Advancing to step 6:
317 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 2100.0
If we subtract 0 from 12, we get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 317

Let's proceed to step 7:
When dividing 121 by 317, we get 0 with a remainder of 121.
The number 0 becomes the next digit in our result. 
Result so far: 21000.0
The remainder is 121 after subtracting 0 from 121.
Fetch the next digit (5) from the dividend, attach it to 121 and continue: 1215 / 317

Step 8:
317 goes into 1215 3 times with a remainder of 264.
The number 3 becomes the next digit in our result. 
Result so far: 210003.0
Deduct 951 from 1215 and we're left with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Moving on to step 9:
2640 divided by 317 is 8 with a remainder of 104.
The number 8 becomes the next digit in our result. 
Result so far: 210003.8
Deduct 2536 from 2640 and we're left with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 10:
When dividing 1040 by 317, we get 3 with a remainder of 89.
The number 3 becomes the next digit in our result. 
Result so far: 210003.83
Subtracting 951 from 1040 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Going ahead to step 11:
317 can be fit into 890 2 times, resulting in a remainder of 256.
The number 2 becomes the next digit in our result. 
Result so far: 210003.832
If we take 634 away from 890, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Let's proceed to step 12:
When dividing 2560 by 317, we get 8 with a remainder of 24.
The next digit of our result is 8. 
Result so far: 210003.8328
The remainder is 24 after subtracting 2536 from 2560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 13:
240 divided by 317 is 0 with a remainder of 240.
Use 0 as the next digit of our solution. 
Result so far: 210003.8328
The remainder is 240 after subtracting 0 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 14:
2400 divided by 317 is 7 with a remainder of 181.
The next digit of our result is 7. 
Result so far: 210003.832807
Deduct 2219 from 2400 and we're left with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Going ahead to step 15:
317 goes into 1810 5 times with a remainder of 225.
Record the quotient 5 as the next digit in the result. 
Result so far: 210003.8328075
The remainder is 225 after subtracting 1585 from 1810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Let's proceed to step 16:
The number 317 fits into 2250 7 times, leaving a remainder of 31.
Record the quotient 7 as the next digit in the result. 
Result so far: 210003.83280757
If we subtract 2219 from 2250, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

In conclusion, the division gives 210003.83280757 with a balance of 3.1e-08.