Having just learned of this myself, I'm rushing it out for your benefit, in case you plan on attending a cocktail party soon and need something with which to first dazzle your co-imbibers and, second, ensure your future happiness. Here it is.
2⁸²⁵⁸⁹⁹³³ – 1
What in hell is that? I hear you cry. Well, as @PhysicsinHistory notes today, it just happens to be "the largest known prime number," containing "24,862,048 digits when written in base 10. It was discovered by a computer volunteered by Patrick Laroche of GIMPS in December 2018." And it's your ticket to freedom.
Adding that final part, especially, will in itself enable you to look much more knowledgeable than they. You'll want to drop the word GIMPS with an air of, Ya'll know what that means, right? Eyes glaze. You then casually mention it stands for the Great Internet Mersenne Prime Search, which (check Wikipedia) "is a collaborative project of volunteers who use freely available software to search for Mersenne prime numbers."
Eyes glaze a bit more. Now surely you people know who Marin Mersenne was, you say next with faint disappointment. I mean, who doesn't? — he being the 17th-century frog polymath universally known for writing prime numbers "in the form of Mn = 2n − 1 for some integer n."
I saved the best part for last. Should you take my advice and behave like a know-it-all jackass at that next dreadful cocktail party where everyone stands around looking uncomfortable with nothing of interest to say, you'll never be re-invited.
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