The total weight of all the ants on Earth is about the same as the weight of all the humans on earth.

Ants also outnumber us a million to one! They also can lift weight twice their size! If they ever wanted to turn on us, they could just pick us all up and throw us in the ocean.  

We humans like to think that we run the world. But even in the heart of our great cities, a rival superpower thrives: the ants. These tiny creatures live all around us in vast numbers, though we hardly even notice them. But in many ways, it is they who really run the show. When ants march together, little can stand in their way. Some ten thousand types are known. They outnumber us a million to one, and the total weight of ants matches that of the entire human race. But could these insect societies really have the edge on us?

Source:  http://www.pbs.org/wgbh/nova/transcripts/2203crea.html