61678184 divided by 645 
The aim is to understand the frequency of 645 in 61678184.

Let's proceed to step 1:
645 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 645

On to step 2:
If we divide 61 by 645, we get 0 and a remainder of 61.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 61 leaves us with 61.
Append the next digit (6) from the dividend to 61 and continue with: 616 / 645

Step 3:
645 can be fit into 616 0 times, resulting in a remainder of 616.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 616 to get 616.
Take the next digit (7) from the dividend and append it to 616, then repeat: 6167 / 645

Moving on to step 4:
645 can be fit into 6167 9 times, resulting in a remainder of 362.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 5805 from 6167 leaves us with 362.
Bring next digit (8) of the dividend behind the 362 and repeat the process: 3628 / 645

Moving on to step 5:
When dividing 3628 by 645, we get 5 with a remainder of 403.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
If we subtract 3225 from 3628, we get 403.
Fetch the next digit (1) from the dividend, attach it to 403 and continue: 4031 / 645

On to step 6:
If we divide 4031 by 645, we get 6 and a remainder of 161.
Record the quotient 6 as the next digit in the result. 
Result so far: 956.0
If we take 3870 away from 4031, we end up with 161.
Grab the next digit (8) from the dividend, add it to 161, then carry on: 1618 / 645

Moving on to step 7:
645 can be fit into 1618 2 times, resulting in a remainder of 328.
Write down 2 as next digit of the result. 
Result so far: 9562.0
The remainder is 328 after subtracting 1290 from 1618.
Bring next digit (4) of the dividend behind the 328 and repeat the process: 3284 / 645

Advancing to step 8:
3284 divided by 645 is 5 with a remainder of 59.
The number 5 becomes the next digit in our result. 
Result so far: 95625.0
Deduct 3225 from 3284 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 9:
The number 645 fits into 590 0 times, leaving a remainder of 590.
The next digit of our result is 0. 
Result so far: 95625.0
The remainder is 590 after subtracting 0 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Let's proceed to step 10:
When dividing 5900 by 645, we get 9 with a remainder of 95.
The number 9 becomes the next digit in our result. 
Result so far: 95625.09
If we take 5805 away from 5900, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Moving on to step 11:
When dividing 950 by 645, we get 1 with a remainder of 305.
The next digit of our result is 1. 
Result so far: 95625.091
Deduct 645 from 950 and we're left with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Going ahead to step 12:
If we divide 3050 by 645, we get 4 and a remainder of 470.
The next digit of our result is 4. 
Result so far: 95625.0914
Subtract 2580 from 3050 to get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 13:
If we divide 4700 by 645, we get 7 and a remainder of 185.
The number 7 becomes the next digit in our result. 
Result so far: 95625.09147
Subtracting 4515 from 4700 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Step 14:
1850 divided by 645 is 2 with a remainder of 560.
Record the quotient 2 as the next digit in the result. 
Result so far: 95625.091472
Subtract 1290 from 1850 to get 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Let's proceed to step 15:
If we divide 5600 by 645, we get 8 and a remainder of 440.
Put 8 as the next digit of the answer. 
Result so far: 95625.0914728
Deduct 5160 from 5600 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Moving on to step 16:
If we divide 4400 by 645, we get 6 and a remainder of 530.
Record the quotient 6 as the next digit in the result. 
Result so far: 95625.09147286
If we subtract 3870 from 4400, we get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

The final result is 95625.09147286 with a remainder of 5.3e-07.