78169637 divided by 561 
The aim is to understand the frequency of 561 in 78169637.

Going ahead to step 1:
The number 561 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 561

On to step 2:
If we divide 78 by 561, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Fetch the next digit (1) from the dividend, attach it to 78 and continue: 781 / 561

Going ahead to step 3:
781 divided by 561 is 1 with a remainder of 220.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 561 away from 781, we end up with 220.
Append the next digit (6) from the dividend to 220 and continue with: 2206 / 561

Step 4:
561 can be fit into 2206 3 times, resulting in a remainder of 523.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 1683 from 2206, we get 523.
Bring next digit (9) of the dividend behind the 523 and repeat the process: 5239 / 561

Let's proceed to step 5:
561 can be fit into 5239 9 times, resulting in a remainder of 190.
The next digit of our result is 9. 
Result so far: 139.0
The remainder is 190 after subtracting 5049 from 5239.
Take the next digit (6) from the dividend and append it to 190, then repeat: 1906 / 561

Let's proceed to step 6:
When dividing 1906 by 561, we get 3 with a remainder of 223.
Use 3 as the next digit of our solution. 
Result so far: 1393.0
Subtract 1683 from 1906 to get 223.
Bring next digit (3) of the dividend behind the 223 and repeat the process: 2233 / 561

Advancing to step 7:
561 can be fit into 2233 3 times, resulting in a remainder of 550.
Use 3 as the next digit of our solution. 
Result so far: 13933.0
If we subtract 1683 from 2233, we get 550.
Include the next digit (7) from the dividend after 550, then repeat: 5507 / 561

Moving on to step 8:
If we divide 5507 by 561, we get 9 and a remainder of 458.
Record the quotient 9 as the next digit in the result. 
Result so far: 139339.0
If we subtract 5049 from 5507, we get 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Going ahead to step 9:
When dividing 4580 by 561, we get 8 with a remainder of 92.
Write down 8 as next digit of the result. 
Result so far: 139339.8
Subtract 4488 from 4580 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 10:
When dividing 920 by 561, we get 1 with a remainder of 359.
The number 1 becomes the next digit in our result. 
Result so far: 139339.81
Deduct 561 from 920 and we're left with 359.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3590, and continue the process.

Moving on to step 11:
The number 561 fits into 3590 6 times, leaving a remainder of 224.
Use 6 as the next digit of our solution. 
Result so far: 139339.816
Subtract 3366 from 3590 to get 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Let's proceed to step 12:
2240 divided by 561 is 3 with a remainder of 557.
Use 3 as the next digit of our solution. 
Result so far: 139339.8163
Subtract 1683 from 2240 to get 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

Going ahead to step 13:
5570 divided by 561 is 9 with a remainder of 521.
Put 9 as the next digit of the answer. 
Result so far: 139339.81639
Subtract 5049 from 5570 to get 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Step 14:
If we divide 5210 by 561, we get 9 and a remainder of 161.
Put 9 as the next digit of the answer. 
Result so far: 139339.816399
Deduct 5049 from 5210 and we're left with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

The final result is 139339.816399 with a remainder of 1.61e-05.