It is a pentacontagon, but I much prefer 50-gon. That way I can be sure that everyone knows exactly what I mean without having to refer to some obscure dictionary. Also, it is less pretentious.
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It is called a Pentacontagon.
this shape is called a Pentacontagon
Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.
Pentacontagon
A cuboid, by definition, has exactly six faces. So a 50 sided cuboid would be called an impossibility. There are many configurations that can give rise to a solid object with 50 faces. For example: a pyramid shape with a 25-sided polygon as base or a prism with 48 sided polygons at each end. There are lots more possibilities and each would have a different name.