When I copy/paste large numbers into Excel from a web page for example:

652398484060

It converts them to something like this

6.52398E+11

How do I keep this from happening? Or when it does, what do I do to reformat the column. I have tried Format -> Cells -> Text (from the "Number" tab in the "Format Cells" box) but this doesn't do anything.

In this case these are FedEx tracking numbers that shouldn't be converted like this.

Thanks