largest number you've had to store in an application?
mildweed: Huge.  Longer than 2^30 digits.  I was working on statistics.  Doing probabilities requires doing some crazy factorials.  These often require handling large freaking numbers.  I'm a PHP guy, so BC Math and GMP Math are my saviors in this area.Thankfully, all the huge numbers are just in the computation of the statistics and don't need to be stored long term in a database.  The thought of having to store an integer in a BLOB is frightening.