We divide 16563000 by 644
The aim is to understand the frequency of 644 in 16563000.

On to step 1:
644 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 644

Going ahead to step 2:
644 goes into 16 0 times with a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 644

Moving on to step 3:
When dividing 165 by 644, we get 0 with a remainder of 165.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 165 to get 165.
Bring next digit (6) of the dividend behind the 165 and repeat the process: 1656 / 644

On to step 4:
1656 divided by 644 is 2 with a remainder of 368.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1288 from 1656 to get 368.
Bring next digit (3) of the dividend behind the 368 and repeat the process: 3683 / 644

Let's proceed to step 5:
The number 644 fits into 3683 5 times, leaving a remainder of 463.
Put 5 as the next digit of the answer. 
Result so far: 25.0
Deduct 3220 from 3683 and we're left with 463.
Take the next digit (0) from the dividend and append it to 463, then repeat: 4630 / 644

Moving on to step 6:
If we divide 4630 by 644, we get 7 and a remainder of 122.
The next digit of our result is 7. 
Result so far: 257.0
The remainder is 122 after subtracting 4508 from 4630.
Include the next digit (0) from the dividend after 122, then repeat: 1220 / 644

Going ahead to step 7:
If we divide 1220 by 644, we get 1 and a remainder of 576.
Use 1 as the next digit of our solution. 
Result so far: 2571.0
Deduct 644 from 1220 and we're left with 576.
Fetch the next digit (0) from the dividend, attach it to 576 and continue: 5760 / 644

Going ahead to step 8:
When dividing 5760 by 644, we get 8 with a remainder of 608.
Use 8 as the next digit of our solution. 
Result so far: 25718.0
Subtract 5152 from 5760 to get 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Let's proceed to step 9:
6080 divided by 644 is 9 with a remainder of 284.
Write down 9 as next digit of the result. 
Result so far: 25718.9
Subtracting 5796 from 6080 leaves us with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Advancing to step 10:
If we divide 2840 by 644, we get 4 and a remainder of 264.
Put 4 as the next digit of the answer. 
Result so far: 25718.94
If we take 2576 away from 2840, we end up with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Advancing to step 11:
When dividing 2640 by 644, we get 4 with a remainder of 64.
Put 4 as the next digit of the answer. 
Result so far: 25718.944
If we subtract 2576 from 2640, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

In conclusion, the division gives 25718.944 with a balance of 0.0064.