Q: What is the negative version of the number 661,721,210?
A: -661,721,210
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:
| 661,721,208 | 661,721,209 | 661,721,211 | 661,721,212 |
| -661,721,208 | -661,721,209 | -661,721,211 | -661,721,212 |