Recently I had a need for a universally unique identifier (UUID) and I stumbled upon this wonderful java.util.UUID mini-FAQ. If you have to use the java.util.UUID at all, you should give this little FAQ a quick read because it's got some great info to save you time in your own digging.
For example, there are 122 significant bits in a version 4 UUID (a pseudo randomly generated number) - that's 2^122 ( 5,316,911,983,139,663,491,615,228,241,121,378,304) or:
five undicillion,
three hundred sixteen decillion,
nine hundred eleven nonillion,
nine hundred eighty-three octillion,
one hundred thirty-nine septillion,
six hundred sixty-three sextillion,
four hundred ninety-one quintillion,
six hundred fifteen quadrillion,
two hundred twenty-eight trillion,
two hundred fourty-one billion,
one hundred twenty-one million,
three hundred seventy-eight thousand,
three hundred four
Man I hope that's correct - that's a damn big number!
