too many.
http://wiki.answers.com/Q/How_many_digits_of_pi_ha...

Pi has now been calculated to more than 200,000,000,000 digits, but the exact
http://www.chacha.com/question/howmanydigitshas...

π (sometimes written pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio
http://askville.amazon.com/AnswerViewer.do?request...

Anyway, "In December 2002, computer scientists Kanada, Ushio and Kuroda computed pi to a world record 1.2411×10^12) (more than one trillion) decimal digits, besting their
http://answers.yahoo.com/question/index?qid=200902...
