Let's divide 81789259 by 660
Let's see how many times 660 fits into 81789259.

Going ahead to step 1:
660 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 660

Moving on to step 2:
If we divide 81 by 660, we get 0 and a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Bring next digit (7) of the dividend behind the 81 and repeat the process: 817 / 660

Going ahead to step 3:
660 can be fit into 817 1 times, resulting in a remainder of 157.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 660 from 817, we get 157.
Take the next digit (8) from the dividend and append it to 157, then repeat: 1578 / 660

Going ahead to step 4:
660 can be fit into 1578 2 times, resulting in a remainder of 258.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 1320 from 1578, we get 258.
Include the next digit (9) from the dividend after 258, then repeat: 2589 / 660

Advancing to step 5:
2589 divided by 660 is 3 with a remainder of 609.
The next digit of our result is 3. 
Result so far: 123.0
Subtract 1980 from 2589 to get 609.
Include the next digit (2) from the dividend after 609, then repeat: 6092 / 660

Moving on to step 6:
The number 660 fits into 6092 9 times, leaving a remainder of 152.
Write down 9 as next digit of the result. 
Result so far: 1239.0
If we subtract 5940 from 6092, we get 152.
Include the next digit (5) from the dividend after 152, then repeat: 1525 / 660

Let's proceed to step 7:
1525 divided by 660 is 2 with a remainder of 205.
The next digit of our result is 2. 
Result so far: 12392.0
If we subtract 1320 from 1525, we get 205.
Fetch the next digit (9) from the dividend, attach it to 205 and continue: 2059 / 660

Advancing to step 8:
When dividing 2059 by 660, we get 3 with a remainder of 79.
The next digit of our result is 3. 
Result so far: 123923.0
The remainder is 79 after subtracting 1980 from 2059.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 9:
660 can be fit into 790 1 times, resulting in a remainder of 130.
The number 1 becomes the next digit in our result. 
Result so far: 123923.1
If we subtract 660 from 790, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 10:
1300 divided by 660 is 1 with a remainder of 640.
Record the quotient 1 as the next digit in the result. 
Result so far: 123923.11
The remainder is 640 after subtracting 660 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

After the division, we end up with 123923.11 and a remainder of 0.64.