Oh, dude, that's easy! A 666-sided shape is called a "hexahectaexacontakaihexagon." Yeah, try saying that five times fast. It's like a regular polygon, but with a devilish twist.
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Most mathematicians would refer to it as a 666-gon.
If someone wanted to be pretentious, or unhelpful, they could call it a hexahectahexacontakaihexagon.
hexcosiahexacontakaihexagram
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon