Diablo 3 has 97 billion possible skill/trait builds. Per class.
LessPop_MoreFizz, emphasis is mine.
I used base two logarithm to claim "97 billion" configurations only are roughly 37 binary choices because $\log_2(97\times10^9) \simeq 36.5$, but I would like to know if there are more refined techniques to remove the marketing out of these big numbers and see their true meaning.