Q: What is the negative version of the number 644,744,621?
A: -644,744,621
Negative numbers are usually written with - in front of them. They represent a number that is less than zero.
Here are more examples of negative numbers in sequence:
| 644,744,619 | 644,744,620 | 644,744,622 | 644,744,623 |
| -644,744,619 | -644,744,620 | -644,744,622 | -644,744,623 |