25621661 divided by 18 
We want to figure out the number of times 25621661 can be divided by 18.

Step 1:
18 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 18

Let's proceed to step 2:
If we divide 25 by 18, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 18 from 25 and we're left with 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 18

On to step 3:
76 divided by 18 is 4 with a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtract 72 from 76 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 18

Going ahead to step 4:
42 divided by 18 is 2 with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 142.0
Subtract 36 from 42 to get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 18

Going ahead to step 5:
If we divide 61 by 18, we get 3 and a remainder of 7.
The next digit of our result is 3. 
Result so far: 1423.0
If we subtract 54 from 61, we get 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 18

Let's proceed to step 6:
76 divided by 18 is 4 with a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 14234.0
The remainder is 4 after subtracting 72 from 76.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 18

On to step 7:
If we divide 46 by 18, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 142342.0
If we take 36 away from 46, we end up with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 18

Moving on to step 8:
18 goes into 101 5 times with a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 1423425.0
If we take 90 away from 101, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 9:
18 can be fit into 110 6 times, resulting in a remainder of 2.
The next digit of our result is 6. 
Result so far: 1423425.6
Deduct 108 from 110 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
18 goes into 20 1 times with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1423425.61
The remainder is 2 after subtracting 18 from 20.
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 11:
18 goes into 20 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 1423425.611
Subtracting 18 from 20 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 1423425.611 with a balance of 0.0002.