If you wish to communicate information, I suggest you call it a 3-billion-gon. Although there is probably a prefix for 3 billion I suggest you keep it simple. Not only is the use of long and unfamiliar Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.
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1.6% of 3,000,000,000= 1.6% * 3000000000= 0.016 * 3000000000= 48,000,000
3000000000 = 3x109
5000
A shape with 9 sides, is a nonagon.
the shape with the most sides is unknown