66612691 ÷ 620 
The aim is to understand the frequency of 620 in 66612691.

Step 1:
6 divided by 620 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 620

Moving on to step 2:
When dividing 66 by 620, we get 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Include the next digit (6) from the dividend after 66, then repeat: 666 / 620

Step 3:
620 can be fit into 666 1 times, resulting in a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 620 from 666, we get 46.
Include the next digit (1) from the dividend after 46, then repeat: 461 / 620

On to step 4:
461 divided by 620 is 0 with a remainder of 461.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Deduct 0 from 461 and we're left with 461.
Include the next digit (2) from the dividend after 461, then repeat: 4612 / 620

Step 5:
620 can be fit into 4612 7 times, resulting in a remainder of 272.
Put 7 as the next digit of the answer. 
Result so far: 107.0
Deduct 4340 from 4612 and we're left with 272.
Take the next digit (6) from the dividend and append it to 272, then repeat: 2726 / 620

Advancing to step 6:
The number 620 fits into 2726 4 times, leaving a remainder of 246.
Use 4 as the next digit of our solution. 
Result so far: 1074.0
The remainder is 246 after subtracting 2480 from 2726.
Take the next digit (9) from the dividend and append it to 246, then repeat: 2469 / 620

Going ahead to step 7:
620 can be fit into 2469 3 times, resulting in a remainder of 609.
The number 3 becomes the next digit in our result. 
Result so far: 10743.0
Subtracting 1860 from 2469 leaves us with 609.
Bring next digit (1) of the dividend behind the 609 and repeat the process: 6091 / 620

Step 8:
620 goes into 6091 9 times with a remainder of 511.
The number 9 becomes the next digit in our result. 
Result so far: 107439.0
If we take 5580 away from 6091, we end up with 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

Going ahead to step 9:
If we divide 5110 by 620, we get 8 and a remainder of 150.
Use 8 as the next digit of our solution. 
Result so far: 107439.8
If we take 4960 away from 5110, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 10:
1500 divided by 620 is 2 with a remainder of 260.
Write down 2 as next digit of the result. 
Result so far: 107439.82
The remainder is 260 after subtracting 1240 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 11:
If we divide 2600 by 620, we get 4 and a remainder of 120.
Use 4 as the next digit of our solution. 
Result so far: 107439.824
Deduct 2480 from 2600 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 12:
When dividing 1200 by 620, we get 1 with a remainder of 580.
Write down 1 as next digit of the result. 
Result so far: 107439.8241
The remainder is 580 after subtracting 620 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Going ahead to step 13:
The number 620 fits into 5800 9 times, leaving a remainder of 220.
Use 9 as the next digit of our solution. 
Result so far: 107439.82419
Subtract 5580 from 5800 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 14:
620 goes into 2200 3 times with a remainder of 340.
Put 3 as the next digit of the answer. 
Result so far: 107439.824193
If we take 1860 away from 2200, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 15:
620 can be fit into 3400 5 times, resulting in a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 107439.8241935
Subtracting 3100 from 3400 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 16:
620 goes into 3000 4 times with a remainder of 520.
The number 4 becomes the next digit in our result. 
Result so far: 107439.82419354
Deduct 2480 from 3000 and we're left with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

The final result is 107439.82419354 with a remainder of 5.2e-07.