Pi has been calculated to its two-quadrillionth digit.
(Yes, using computers at Yahoo to crunch the numbers, a researcher, Nicholas Sze, has calculated the 2,000,000,000,000,000th digit of the mathematical constant pi. It took 23 days on 1,000 of Yahoo's computers, but don't try this at home, on a standard PC, the calculation would take around 500 years!)