Store a huge number in the table

Hi

For my academic project, I need to store few huge numbers (256 significant digits) in the database tables.

Oracle Supports:
Positive numbers in the range 1 x 10-130 to 9.99...9 x 10125 with up to 38 significant digits

My Question is: Can anyone suggest me a database system that can support such huge numbers? What do scientists use? or lets say NASA would use for all their calculations with numbers that humans can not read?

Any pointers will be appreciated.

P.S. I did google search and forum search for this topic but it did not yield any favorable results.

Regards
Milind

Store as strings, BLOB, binary, or factor the number.