51866061 ÷ 6 
The aim is to understand the frequency of 6 in 51866061.

Advancing to step 1:
If we divide 5 by 6, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 6

Step 2:
6 goes into 51 8 times with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 48 from 51 to get 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 6

Let's proceed to step 3:
When dividing 38 by 6, we get 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 86.0
If we subtract 36 from 38, we get 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 6

Step 4:
When dividing 26 by 6, we get 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 864.0
If we take 24 away from 26, we end up with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 6

Step 5:
6 can be fit into 26 4 times, resulting in a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 8644.0
If we subtract 24 from 26, we get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 6

Let's proceed to step 6:
The number 6 fits into 20 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 86443.0
Subtract 18 from 20 to get 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 6

On to step 7:
When dividing 26 by 6, we get 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 864434.0
If we take 24 away from 26, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 6

Going ahead to step 8:
The number 6 fits into 21 3 times, leaving a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 8644343.0
If we subtract 18 from 21, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 9:
6 goes into 30 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 8644343.5
Subtract 30 from 30 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
6 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8644343.5
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
0 divided by 6 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8644343.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 8644343.5, and the remainder is 0.0.