Listening to Stephen Fry rabbit on on QI while doing some late night blogging. They were talking about “666”, the “number of the beast” (Revelation 13:18), and Fry quickly raced off the following:
$665.95 = the retail price of the Beast
25.8069758… = the root of all evil
Hexakosioihexekontahexaphobia = the fear of the Number of the Beast
Looking for these on the Internet found a number of sites, including this one, which give a whole list of them.