A Truely Large Prime
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

Eve, the now ubiquitous eaves-dropper, first considered cryptology when her Dad showed her a very large prime.  Curiously it was also the smallest prime.
a big 2 is a big
Image by Matthew Harvey © 2003