Q: What is the negative version of the number 661,421,409?
A: -661,421,409
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:
| 661,421,407 | 661,421,408 | 661,421,410 | 661,421,411 |
| -661,421,407 | -661,421,408 | -661,421,410 | -661,421,411 |