We look at the division of 15091961 by 577 
We want to figure out the number of times 15091961 can be divided by 577.

Going ahead to step 1:
When dividing 1 by 577, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 577

Step 2:
577 goes into 15 0 times with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 577

On to step 3:
If we divide 150 by 577, we get 0 and a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 150 and we're left with 150.
Bring next digit (9) of the dividend behind the 150 and repeat the process: 1509 / 577

Advancing to step 4:
The number 577 fits into 1509 2 times, leaving a remainder of 355.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1154 away from 1509, we end up with 355.
Fetch the next digit (1) from the dividend, attach it to 355 and continue: 3551 / 577

Going ahead to step 5:
3551 divided by 577 is 6 with a remainder of 89.
Write down 6 as next digit of the result. 
Result so far: 26.0
If we take 3462 away from 3551, we end up with 89.
Bring next digit (9) of the dividend behind the 89 and repeat the process: 899 / 577

On to step 6:
If we divide 899 by 577, we get 1 and a remainder of 322.
Write down 1 as next digit of the result. 
Result so far: 261.0
Deduct 577 from 899 and we're left with 322.
Bring next digit (6) of the dividend behind the 322 and repeat the process: 3226 / 577

Going ahead to step 7:
When dividing 3226 by 577, we get 5 with a remainder of 341.
Write down 5 as next digit of the result. 
Result so far: 2615.0
If we take 2885 away from 3226, we end up with 341.
Grab the next digit (1) from the dividend, add it to 341, then carry on: 3411 / 577

Moving on to step 8:
577 can be fit into 3411 5 times, resulting in a remainder of 526.
The number 5 becomes the next digit in our result. 
Result so far: 26155.0
If we subtract 2885 from 3411, we get 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

Going ahead to step 9:
577 can be fit into 5260 9 times, resulting in a remainder of 67.
Put 9 as the next digit of the answer. 
Result so far: 26155.9
Subtracting 5193 from 5260 leaves us with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 10:
577 goes into 670 1 times with a remainder of 93.
The number 1 becomes the next digit in our result. 
Result so far: 26155.91
Deduct 577 from 670 and we're left with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Moving on to step 11:
If we divide 930 by 577, we get 1 and a remainder of 353.
Record the quotient 1 as the next digit in the result. 
Result so far: 26155.911
If we subtract 577 from 930, we get 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

The quotient of the division is 26155.911, and the remainder is 0.0353.