One billion seconds is equal to 31 years, 251 days, 13 hours, 34 minutes, and 54.7843 seconds (not counting leap days and leap seconds). AdvertisementBillions, Trillions and QuadrillionsBy the commonly accepted definition we use today, one billion is equal to a thousand millions. If you ordered it to take you one trillion seconds back in time, you'd get to hang out with mammoths and saber-toothed cats because one trillion seconds is the equivalent of 31,546 years. In January, 2018, math enthusiast Jonathan Pace identified what is, to date, the biggest known prime number. To be sure, M77232917 isn't in the same league as the Googolplex or Skewes' number.