Q: What is the negative version of the number 666,721,815?
A: -666,721,815
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:
| 666,721,813 | 666,721,814 | 666,721,816 | 666,721,817 |
| -666,721,813 | -666,721,814 | -666,721,816 | -666,721,817 |