Usability Views Article Details  home | timeline | recent | popular | e-reports | userati | books | about  The Largest Prime Number (29 Oct 2003) When written down it's 4,053,900 digits long and fills 2 telephone directories. So, as you can imagine, it's not the kind of number you're likely to stumble over often. Unless you're Bill Gates checking your bank statement at the end of the month. Article URL: http://www.bbc.co.uk/radio4/science/another53.shtml   14.47    (Another 5 Numbers)   Read 169 more articles from BBC Radio 4 sorted by date, popularity, or title. Next Article: Twilight of the dorks? This site is a labour of love built by Chris McEvoy