TIL The 65537-sided hexamyriapentachiliapentahectatriacontaheptagon is the largest known constructible polygon: that is, it can be constructed using a compass and an unmarked straightedge.

https://en.wikipedia.org/wiki/65537-gon

https://www.reddit.com/r/todayilearned/comments/150xvag/til_the_65537sided/