65861644 ÷ 858 
We want to divide 65861644 by 858.

Advancing to step 1:
If we divide 6 by 858, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 858

Let's proceed to step 2:
858 goes into 65 0 times with a remainder of 65.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 65 to get 65.
Include the next digit (8) from the dividend after 65, then repeat: 658 / 858

Advancing to step 3:
858 goes into 658 0 times with a remainder of 658.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 658 leaves us with 658.
Append the next digit (6) from the dividend to 658 and continue with: 6586 / 858

Step 4:
858 can be fit into 6586 7 times, resulting in a remainder of 580.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 6006 away from 6586, we end up with 580.
Grab the next digit (1) from the dividend, add it to 580, then carry on: 5801 / 858

Moving on to step 5:
When dividing 5801 by 858, we get 6 with a remainder of 653.
Write down 6 as next digit of the result. 
Result so far: 76.0
Subtracting 5148 from 5801 leaves us with 653.
Fetch the next digit (6) from the dividend, attach it to 653 and continue: 6536 / 858

Moving on to step 6:
858 can be fit into 6536 7 times, resulting in a remainder of 530.
Use 7 as the next digit of our solution. 
Result so far: 767.0
If we take 6006 away from 6536, we end up with 530.
Include the next digit (4) from the dividend after 530, then repeat: 5304 / 858

Step 7:
858 goes into 5304 6 times with a remainder of 156.
Record the quotient 6 as the next digit in the result. 
Result so far: 7676.0
If we take 5148 away from 5304, we end up with 156.
Append the next digit (4) from the dividend to 156 and continue with: 1564 / 858

Going ahead to step 8:
1564 divided by 858 is 1 with a remainder of 706.
Use 1 as the next digit of our solution. 
Result so far: 76761.0
The remainder is 706 after subtracting 858 from 1564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7060, and continue the process.

Step 9:
858 goes into 7060 8 times with a remainder of 196.
The number 8 becomes the next digit in our result. 
Result so far: 76761.8
The remainder is 196 after subtracting 6864 from 7060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Advancing to step 10:
When dividing 1960 by 858, we get 2 with a remainder of 244.
The number 2 becomes the next digit in our result. 
Result so far: 76761.82
The remainder is 244 after subtracting 1716 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Let's proceed to step 11:
2440 divided by 858 is 2 with a remainder of 724.
The next digit of our result is 2. 
Result so far: 76761.822
The remainder is 724 after subtracting 1716 from 2440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7240, and continue the process.

The final outcome is 76761.822, with a leftover of 0.0724.