We look at the division of 66786749 by 609 
The aim is to understand the frequency of 609 in 66786749.

Advancing to step 1:
609 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
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 609

On to step 2:
When dividing 66 by 609, we get 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (7) from the dividend, add it to 66, then carry on: 667 / 609

Advancing to step 3:
If we divide 667 by 609, we get 1 and a remainder of 58.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 609 from 667, we get 58.
Fetch the next digit (8) from the dividend, attach it to 58 and continue: 588 / 609

Step 4:
If we divide 588 by 609, we get 0 and a remainder of 588.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 588 leaves us with 588.
Bring next digit (6) of the dividend behind the 588 and repeat the process: 5886 / 609

Let's proceed to step 5:
609 can be fit into 5886 9 times, resulting in a remainder of 405.
Write down 9 as next digit of the result. 
Result so far: 109.0
The remainder is 405 after subtracting 5481 from 5886.
Fetch the next digit (7) from the dividend, attach it to 405 and continue: 4057 / 609

Let's proceed to step 6:
4057 divided by 609 is 6 with a remainder of 403.
Use 6 as the next digit of our solution. 
Result so far: 1096.0
Subtracting 3654 from 4057 leaves us with 403.
Include the next digit (4) from the dividend after 403, then repeat: 4034 / 609

Advancing to step 7:
The number 609 fits into 4034 6 times, leaving a remainder of 380.
Put 6 as the next digit of the answer. 
Result so far: 10966.0
If we take 3654 away from 4034, we end up with 380.
Grab the next digit (9) from the dividend, add it to 380, then carry on: 3809 / 609

Let's proceed to step 8:
609 can be fit into 3809 6 times, resulting in a remainder of 155.
The number 6 becomes the next digit in our result. 
Result so far: 109666.0
Deduct 3654 from 3809 and we're left with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Step 9:
609 can be fit into 1550 2 times, resulting in a remainder of 332.
The number 2 becomes the next digit in our result. 
Result so far: 109666.2
Subtracting 1218 from 1550 leaves us with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Moving on to step 10:
The number 609 fits into 3320 5 times, leaving a remainder of 275.
The next digit of our result is 5. 
Result so far: 109666.25
Deduct 3045 from 3320 and we're left with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Let's proceed to step 11:
The number 609 fits into 2750 4 times, leaving a remainder of 314.
Put 4 as the next digit of the answer. 
Result so far: 109666.254
Subtract 2436 from 2750 to get 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 12:
If we divide 3140 by 609, we get 5 and a remainder of 95.
The number 5 becomes the next digit in our result. 
Result so far: 109666.2545
If we subtract 3045 from 3140, we get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 13:
The number 609 fits into 950 1 times, leaving a remainder of 341.
The number 1 becomes the next digit in our result. 
Result so far: 109666.25451
The remainder is 341 after subtracting 609 from 950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Moving on to step 14:
3410 divided by 609 is 5 with a remainder of 365.
Write down 5 as next digit of the result. 
Result so far: 109666.254515
Deduct 3045 from 3410 and we're left with 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Advancing to step 15:
609 can be fit into 3650 5 times, resulting in a remainder of 605.
The next digit of our result is 5. 
Result so far: 109666.2545155
Subtract 3045 from 3650 to get 605.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

The final result is 109666.2545155 with a remainder of 6.05e-06.