How to Calculate Bigger and Bigger Factorials

Someone used the one plus default calculator app to get up to 48,884 factorial and someone's sharp, EL501x, it stopped working at 69 factorial. We talked about how I calculated if Michael Jackson's hair catching on fire during the Pepsi commercial was the exact middle point of his life. Someone got a touch and said a friend of a friend was there. They were a costume designer and they were part of the crew when it happened. And they offered to put me in touch to get a more accurate time for exactly when it occurred.