1 - (((2^4096) - 1)/(2^4096))^(((2.5*10^11)((2.5*10^11)-1))/2)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.