We look at the division of 19455258 by 581 
The aim is to understand the frequency of 581 in 19455258.

On to step 1:
581 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 581

Step 2:
If we divide 19 by 581, we get 0 and a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 19, we end up with 19.
Append the next digit (4) from the dividend to 19 and continue with: 194 / 581

Let's proceed to step 3:
581 goes into 194 0 times with a remainder of 194.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 194, we end up with 194.
Grab the next digit (5) from the dividend, add it to 194, then carry on: 1945 / 581

Going ahead to step 4:
1945 divided by 581 is 3 with a remainder of 202.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 1743 from 1945 to get 202.
Bring next digit (5) of the dividend behind the 202 and repeat the process: 2025 / 581

Moving on to step 5:
The number 581 fits into 2025 3 times, leaving a remainder of 282.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
Deduct 1743 from 2025 and we're left with 282.
Grab the next digit (2) from the dividend, add it to 282, then carry on: 2822 / 581

Let's proceed to step 6:
581 goes into 2822 4 times with a remainder of 498.
The number 4 becomes the next digit in our result. 
Result so far: 334.0
If we subtract 2324 from 2822, we get 498.
Append the next digit (5) from the dividend to 498 and continue with: 4985 / 581

Going ahead to step 7:
The number 581 fits into 4985 8 times, leaving a remainder of 337.
Record the quotient 8 as the next digit in the result. 
Result so far: 3348.0
If we subtract 4648 from 4985, we get 337.
Bring next digit (8) of the dividend behind the 337 and repeat the process: 3378 / 581

Moving on to step 8:
The number 581 fits into 3378 5 times, leaving a remainder of 473.
The number 5 becomes the next digit in our result. 
Result so far: 33485.0
If we take 2905 away from 3378, we end up with 473.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4730, and continue the process.

Moving on to step 9:
581 goes into 4730 8 times with a remainder of 82.
Use 8 as the next digit of our solution. 
Result so far: 33485.8
Subtract 4648 from 4730 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Step 10:
820 divided by 581 is 1 with a remainder of 239.
The number 1 becomes the next digit in our result. 
Result so far: 33485.81
If we take 581 away from 820, we end up with 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Advancing to step 11:
2390 divided by 581 is 4 with a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 33485.814
The remainder is 66 after subtracting 2324 from 2390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 12:
When dividing 660 by 581, we get 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 33485.8141
If we subtract 581 from 660, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 13:
The number 581 fits into 790 1 times, leaving a remainder of 209.
Record the quotient 1 as the next digit in the result. 
Result so far: 33485.81411
Deduct 581 from 790 and we're left with 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

After the division, we end up with 33485.81411 and a remainder of 0.000209.