enneadecagon or enneakaidecagon
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A polygon refers to a plane figure that has at least three straight sides and angles. An 18 sided shape is called an octadecagon or octakaidecagon.
An eighteen-sided shape is called an octakaidecagon, or octadecagon.
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A 999 sided shape is simply known as a 999 sided shape.
A nonagon is a nine sided shape.