There are some numbers that do not change in our world. Those numbers are called fundamental constants. The gravitational constant , the electric constant , the magnetic constant are examples. If these numbers were different from what we have now, the world would be very different from the one we live in.
Here are the exact numbers.

A fascinating fact about these constants is the relationship between the electric constant and the magnetic constant. The ratio of the electric constant and the magnetic constant is :

This relationship was realized by Maxwell after it was found out that Electricity and Magnetism are related.