61801073 divided by 638 
The aim is to understand the frequency of 638 in 61801073.

Step 1:
638 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 638

Going ahead to step 2:
If we divide 61 by 638, we get 0 and a remainder of 61.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 61, we end up with 61.
Take the next digit (8) from the dividend and append it to 61, then repeat: 618 / 638

Let's proceed to step 3:
If we divide 618 by 638, we get 0 and a remainder of 618.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 618, we end up with 618.
Grab the next digit (0) from the dividend, add it to 618, then carry on: 6180 / 638

Let's proceed to step 4:
The number 638 fits into 6180 9 times, leaving a remainder of 438.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtracting 5742 from 6180 leaves us with 438.
Fetch the next digit (1) from the dividend, attach it to 438 and continue: 4381 / 638

Step 5:
4381 divided by 638 is 6 with a remainder of 553.
Use 6 as the next digit of our solution. 
Result so far: 96.0
If we subtract 3828 from 4381, we get 553.
Take the next digit (0) from the dividend and append it to 553, then repeat: 5530 / 638

Step 6:
The number 638 fits into 5530 8 times, leaving a remainder of 426.
The number 8 becomes the next digit in our result. 
Result so far: 968.0
Subtract 5104 from 5530 to get 426.
Append the next digit (7) from the dividend to 426 and continue with: 4267 / 638

Going ahead to step 7:
4267 divided by 638 is 6 with a remainder of 439.
Use 6 as the next digit of our solution. 
Result so far: 9686.0
If we subtract 3828 from 4267, we get 439.
Bring next digit (3) of the dividend behind the 439 and repeat the process: 4393 / 638

Step 8:
4393 divided by 638 is 6 with a remainder of 565.
Write down 6 as next digit of the result. 
Result so far: 96866.0
If we take 3828 away from 4393, we end up with 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Step 9:
The number 638 fits into 5650 8 times, leaving a remainder of 546.
Record the quotient 8 as the next digit in the result. 
Result so far: 96866.8
If we take 5104 away from 5650, we end up with 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Let's proceed to step 10:
638 goes into 5460 8 times with a remainder of 356.
Use 8 as the next digit of our solution. 
Result so far: 96866.88
Subtracting 5104 from 5460 leaves us with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

The final outcome is 96866.88, with a leftover of 0.356.