We look at the division of 15906772 by 666 
The aim is to understand the frequency of 666 in 15906772.

Moving on to step 1:
When dividing 1 by 666, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 666

On to step 2:
666 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 666

On to step 3:
666 goes into 159 0 times with a remainder of 159.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 159 leaves us with 159.
Grab the next digit (0) from the dividend, add it to 159, then carry on: 1590 / 666

Going ahead to step 4:
When dividing 1590 by 666, we get 2 with a remainder of 258.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1332 from 1590 leaves us with 258.
Append the next digit (6) from the dividend to 258 and continue with: 2586 / 666

Step 5:
666 goes into 2586 3 times with a remainder of 588.
Write down 3 as next digit of the result. 
Result so far: 23.0
Subtracting 1998 from 2586 leaves us with 588.
Grab the next digit (7) from the dividend, add it to 588, then carry on: 5887 / 666

Step 6:
When dividing 5887 by 666, we get 8 with a remainder of 559.
Write down 8 as next digit of the result. 
Result so far: 238.0
If we take 5328 away from 5887, we end up with 559.
Take the next digit (7) from the dividend and append it to 559, then repeat: 5597 / 666

Advancing to step 7:
666 can be fit into 5597 8 times, resulting in a remainder of 269.
Put 8 as the next digit of the answer. 
Result so far: 2388.0
If we take 5328 away from 5597, we end up with 269.
Bring next digit (2) of the dividend behind the 269 and repeat the process: 2692 / 666

Step 8:
When dividing 2692 by 666, we get 4 with a remainder of 28.
Write down 4 as next digit of the result. 
Result so far: 23884.0
Deduct 2664 from 2692 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 9:
666 can be fit into 280 0 times, resulting in a remainder of 280.
The next digit of our result is 0. 
Result so far: 23884.0
Deduct 0 from 280 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 10:
666 can be fit into 2800 4 times, resulting in a remainder of 136.
Put 4 as the next digit of the answer. 
Result so far: 23884.04
Subtracting 2664 from 2800 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Let's proceed to step 11:
1360 divided by 666 is 2 with a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 23884.042
Subtracting 1332 from 1360 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 12:
The number 666 fits into 280 0 times, leaving a remainder of 280.
Use 0 as the next digit of our solution. 
Result so far: 23884.042
The remainder is 280 after subtracting 0 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 13:
The number 666 fits into 2800 4 times, leaving a remainder of 136.
Put 4 as the next digit of the answer. 
Result so far: 23884.04204
If we take 2664 away from 2800, we end up with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Moving on to step 14:
1360 divided by 666 is 2 with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 23884.042042
Subtracting 1332 from 1360 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 15:
280 divided by 666 is 0 with a remainder of 280.
Use 0 as the next digit of our solution. 
Result so far: 23884.042042
Subtracting 0 from 280 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 16:
If we divide 2800 by 666, we get 4 and a remainder of 136.
Write down 4 as next digit of the result. 
Result so far: 23884.04204204
If we take 2664 away from 2800, we end up with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Our division results in 23884.04204204 with a remaining 1.36e-07.