Q: What is the negative version of the number 644,405,440?
A: -644,405,440
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:
| 644,405,438 | 644,405,439 | 644,405,441 | 644,405,442 |
| -644,405,438 | -644,405,439 | -644,405,441 | -644,405,442 |