521966 ÷ 2 
We want to figure out the number of times 521966 can be divided by 2.

Step 1:
If we divide 5 by 2, we get 2 and a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 4 from 5 and we're left with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 2

Going ahead to step 2:
2 can be fit into 12 6 times, resulting in a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Deduct 12 from 12 and we're left with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 2

Advancing to step 3:
When dividing 1 by 2, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 260.0
If we subtract 0 from 1, we get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 2

Moving on to step 4:
2 goes into 19 9 times with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 2609.0
Deduct 18 from 19 and we're left with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 2

Step 5:
The number 2 fits into 16 8 times, leaving a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 26098.0
If we subtract 16 from 16, we get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 2

Going ahead to step 6:
The number 2 fits into 6 3 times, leaving a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 260983.0
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:
If we divide 0 by 2, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 260983.0
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.

Advancing to step 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 260983.0
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.

Our division results in 260983.0 with a remaining 0.0.