25585809 ÷ 391 
The aim is to understand the frequency of 391 in 25585809.

Advancing to step 1:
The number 391 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 391

Moving on to step 2:
If we divide 25 by 391, we get 0 and a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 25, we end up with 25.
Take the next digit (5) from the dividend and append it to 25, then repeat: 255 / 391

Moving on to step 3:
When dividing 255 by 391, we get 0 with a remainder of 255.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 255, we get 255.
Append the next digit (8) from the dividend to 255 and continue with: 2558 / 391

Going ahead to step 4:
2558 divided by 391 is 6 with a remainder of 212.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 2346 from 2558 and we're left with 212.
Take the next digit (5) from the dividend and append it to 212, then repeat: 2125 / 391

Let's proceed to step 5:
If we divide 2125 by 391, we get 5 and a remainder of 170.
The next digit of our result is 5. 
Result so far: 65.0
If we take 1955 away from 2125, we end up with 170.
Append the next digit (8) from the dividend to 170 and continue with: 1708 / 391

On to step 6:
The number 391 fits into 1708 4 times, leaving a remainder of 144.
Write down 4 as next digit of the result. 
Result so far: 654.0
Subtract 1564 from 1708 to get 144.
Append the next digit (0) from the dividend to 144 and continue with: 1440 / 391

Moving on to step 7:
1440 divided by 391 is 3 with a remainder of 267.
The number 3 becomes the next digit in our result. 
Result so far: 6543.0
The remainder is 267 after subtracting 1173 from 1440.
Append the next digit (9) from the dividend to 267 and continue with: 2679 / 391

Step 8:
391 goes into 2679 6 times with a remainder of 333.
The number 6 becomes the next digit in our result. 
Result so far: 65436.0
The remainder is 333 after subtracting 2346 from 2679.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Let's proceed to step 9:
If we divide 3330 by 391, we get 8 and a remainder of 202.
Record the quotient 8 as the next digit in the result. 
Result so far: 65436.8
If we take 3128 away from 3330, we end up with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

On to step 10:
2020 divided by 391 is 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 65436.85
The remainder is 65 after subtracting 1955 from 2020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 11:
650 divided by 391 is 1 with a remainder of 259.
Write down 1 as next digit of the result. 
Result so far: 65436.851
The remainder is 259 after subtracting 391 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Let's proceed to step 12:
391 can be fit into 2590 6 times, resulting in a remainder of 244.
Use 6 as the next digit of our solution. 
Result so far: 65436.8516
If we subtract 2346 from 2590, we get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Moving on to step 13:
391 can be fit into 2440 6 times, resulting in a remainder of 94.
The next digit of our result is 6. 
Result so far: 65436.85166
Subtract 2346 from 2440 to get 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Our division results in 65436.85166 with a remaining 9.4e-05.