Q: What is the negative version of the number 640,665,421?
A: -640,665,421
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:
| 640,665,419 | 640,665,420 | 640,665,422 | 640,665,423 |
| -640,665,419 | -640,665,420 | -640,665,422 | -640,665,423 |