The formal name is icosihexagon. Most people, including mathematicians, will use 26-gon since that effectively communicates the size of the polygon. But, if you want to appear pretentious or be obfuscatory, by all means use the Greek prefices.
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A five-sided polygon is called a pentagon.
A 39 sided polygon is called a 39-gon.
A thousand-sided polygon is a chiliagon.
hectoctagon is a 108 sided polygon
a hectoenneagon is a 109 sided polygon