Q: What is the negative version of the number 663,607,621?
A: -663,607,621
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:
| 663,607,619 | 663,607,620 | 663,607,622 | 663,607,623 |
| -663,607,619 | -663,607,620 | -663,607,622 | -663,607,623 |