81645697 ÷ 647 
Let's see how many times 647 fits into 81645697.

Going ahead to step 1:
8 divided by 647 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 647

On to step 2:
81 divided by 647 is 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Grab the next digit (6) from the dividend, add it to 81, then carry on: 816 / 647

Going ahead to step 3:
647 can be fit into 816 1 times, resulting in a remainder of 169.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 647 away from 816, we end up with 169.
Bring next digit (4) of the dividend behind the 169 and repeat the process: 1694 / 647

Moving on to step 4:
When dividing 1694 by 647, we get 2 with a remainder of 400.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 400 after subtracting 1294 from 1694.
Grab the next digit (5) from the dividend, add it to 400, then carry on: 4005 / 647

On to step 5:
When dividing 4005 by 647, we get 6 with a remainder of 123.
The next digit of our result is 6. 
Result so far: 126.0
Deduct 3882 from 4005 and we're left with 123.
Bring next digit (6) of the dividend behind the 123 and repeat the process: 1236 / 647

Let's proceed to step 6:
647 goes into 1236 1 times with a remainder of 589.
Put 1 as the next digit of the answer. 
Result so far: 1261.0
Subtracting 647 from 1236 leaves us with 589.
Include the next digit (9) from the dividend after 589, then repeat: 5899 / 647

Moving on to step 7:
If we divide 5899 by 647, we get 9 and a remainder of 76.
Write down 9 as next digit of the result. 
Result so far: 12619.0
Deduct 5823 from 5899 and we're left with 76.
Bring next digit (7) of the dividend behind the 76 and repeat the process: 767 / 647

Let's proceed to step 8:
When dividing 767 by 647, we get 1 with a remainder of 120.
Use 1 as the next digit of our solution. 
Result so far: 126191.0
The remainder is 120 after subtracting 647 from 767.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 9:
When dividing 1200 by 647, we get 1 with a remainder of 553.
The number 1 becomes the next digit in our result. 
Result so far: 126191.1
Subtracting 647 from 1200 leaves us with 553.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5530, and continue the process.

Step 10:
647 goes into 5530 8 times with a remainder of 354.
Put 8 as the next digit of the answer. 
Result so far: 126191.18
If we take 5176 away from 5530, we end up with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Advancing to step 11:
3540 divided by 647 is 5 with a remainder of 305.
Use 5 as the next digit of our solution. 
Result so far: 126191.185
Deduct 3235 from 3540 and we're left with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Advancing to step 12:
647 can be fit into 3050 4 times, resulting in a remainder of 462.
Put 4 as the next digit of the answer. 
Result so far: 126191.1854
If we take 2588 away from 3050, we end up with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Going ahead to step 13:
When dividing 4620 by 647, we get 7 with a remainder of 91.
The next digit of our result is 7. 
Result so far: 126191.18547
The remainder is 91 after subtracting 4529 from 4620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Step 14:
If we divide 910 by 647, we get 1 and a remainder of 263.
Record the quotient 1 as the next digit in the result. 
Result so far: 126191.185471
Subtracting 647 from 910 leaves us with 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Advancing to step 15:
2630 divided by 647 is 4 with a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 126191.1854714
If we subtract 2588 from 2630, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 16:
420 divided by 647 is 0 with a remainder of 420.
The next digit of our result is 0. 
Result so far: 126191.1854714
Subtract 0 from 420 to get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

The final result is 126191.1854714 with a remainder of 4.2e-07.