81345909 ÷ 1 
We want to figure out the number of times 81345909 can be divided by 1.

Going ahead to step 1:
When dividing 8 by 1, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 8 from 8 leaves us with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 1

Let's proceed to step 2:
If we divide 1 by 1, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 81.0
Subtract 1 from 1 to get 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 1

Going ahead to step 3:
1 goes into 3 3 times with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 813.0
Subtracting 3 from 3 leaves us with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 1

Step 4:
If we divide 4 by 1, we get 4 and a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 8134.0
The remainder is 0 after subtracting 4 from 4.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 1

Going ahead to step 5:
5 divided by 1 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 81345.0
The remainder is 0 after subtracting 5 from 5.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 1

Advancing to step 6:
If we divide 9 by 1, we get 9 and a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 813459.0
Deduct 9 from 9 and we're left with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 1

Let's proceed to step 7:
If we divide 0 by 1, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8134590.0
Deduct 0 from 0 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 1

Let's proceed to step 8:
1 goes into 9 9 times with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 81345909.0
The remainder is 0 after subtracting 9 from 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
0 divided by 1 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 81345909.0
If we subtract 0 from 0, we 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.

Step 10:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 81345909.0
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.

The final result is 81345909.0 with a remainder of 0.0.