We divide 77580861 by 16
We want to figure out the number of times 77580861 can be divided by 16.

Moving on to step 1:
If we divide 7 by 16, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 16

Going ahead to step 2:
When dividing 77 by 16, we get 4 with a remainder of 13.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 64 away from 77, we end up with 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 16

Moving on to step 3:
135 divided by 16 is 8 with a remainder of 7.
The next digit of our result is 8. 
Result so far: 48.0
If we take 128 away from 135, we end up with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 16

On to step 4:
When dividing 78 by 16, we get 4 with a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 484.0
Subtracting 64 from 78 leaves us with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 16

Advancing to step 5:
If we divide 140 by 16, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 4848.0
Subtract 128 from 140 to get 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 16

Step 6:
128 divided by 16 is 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 48488.0
If we subtract 128 from 128, we get 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 16

Going ahead to step 7:
16 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 484880.0
If we subtract 0 from 6, we get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 16

Going ahead to step 8:
The number 16 fits into 61 3 times, leaving a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 4848803.0
Subtract 48 from 61 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 9:
When dividing 130 by 16, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 4848803.8
If we subtract 128 from 130, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
20 divided by 16 is 1 with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 4848803.81
If we subtract 16 from 20, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
16 goes into 40 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 4848803.812
The remainder is 8 after subtracting 32 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
16 can be fit into 80 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4848803.8125
Deduct 80 from 80 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.

Let's proceed to step 13:
When dividing 0 by 16, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4848803.8125
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 14:
0 divided by 16 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4848803.8125
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.

The final outcome is 4848803.8125, with a leftover of 0.0.