Hexamyriapentachiliapentahectatriacontaheptagon

A hexamyriapentachiliapentahectatriacontaheptagon is a 65537 sided polygon, with a Schläfli symbol {65537}.

It is not visually distinguishable from a circle, and differs from one by only 15 parts per billion, as it's internal angle is 179.99 degrees.

The polygon is the largest Fermat number, and therefore is constructible using a compass and unmarked straightedge.

The first explicit construction of a hexamyriapentachiliapentahectatriacontaheptagon was given by Johann Gustav Hermes.

Johann Gustav Hermes spent 10 years completing the 200-page manuscript of the Fermat numbers 3 5 17 257 65537.

Another method involves using 1332 Carlyle circles.