title: Storing a very, very large number theoretical
body: <p>It's old news, but I was recently reading about the largest prime numbers, which about one year ago a 17 million digit prime number was found (the largest to date).  This got me thinking a little bit as you have to be able to compute the number to ensure that it is prime. What methods could be implemented to do this? I'm unaware of any data type that could hold this much data and still allow it to be computed. Can BigInt handle this?</p>