So, I'm trying to find a way to calculate one million factorial in the simplest way I can understand. For those who don't know, a million factorial (or 1,000,000!) = 1,000,000 * 999,999 * 999,998 * 999,997 * etc. I know how to find the sum (which is 500,000,500,000 using arithmetic series), but not the product. Is there a way to figure it out without having to run it in a coding language? Thanks in advance.
(& believe it or not this isn't for school I just actually wanted to know)