866486 ÷ 1 
Our goal is to divide 866486 by 1.

Advancing to step 1:
The number 1 fits into 8 8 times, leaving a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 8 from 8 leaves us with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 1

Step 2:
If we divide 6 by 1, we get 6 and a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 86.0
Subtracting 6 from 6 leaves us with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 1

Going ahead to step 3:
If we divide 6 by 1, we get 6 and a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 866.0
Subtract 6 from 6 to get 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 1

Step 4:
1 can be fit into 4 4 times, resulting in a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 8664.0
If we take 4 away from 4, we end up with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 1

Step 5:
The number 1 fits into 8 8 times, leaving a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 86648.0
Subtracting 8 from 8 leaves us with 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 1

Let's proceed to step 6:
If we divide 6 by 1, we get 6 and a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 866486.0
Subtract 6 from 6 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.

Moving on to step 7:
1 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: 866486.0
Subtracting 0 from 0 leaves us 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.

Going ahead to step 8:
1 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 866486.0
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 866486.0, and the remainder is 0.0.