VS 2010 Is there any way to do math operation with numbers bigger than max long value?

I'm trying to divide a very large random number (bigger than 9223372036854775807 that is the maximum of Long in vb) by 2 for example, and if I msgbox the output it will be smth like x.xxxxxxxxxxxxxxxxE+xx (when I declare the number as a string and have option strict off).
So any way to get the real value?