Its not just for stress testing!
http://lightyears.blogs.cnn.com/2013/02/06/largest-prime-number-yet-discovered/?hpt=hp_t2You know you're a geek if you felt all warm and fuzzy inside when you read that headline. If you got here by accident, here's the news: The biggest prime number yet has been discovered.
It is indeed massive, more than 17 million digits long. A text file of the entire number contains more than 22 megabytes of information.