A femtillion is a numerical value equal to 10^15 or 1,000,000,000,000,000. It is a term used in the short scale number system, which is commonly used in the United States and many other countries. In scientific notation, it represents a quintillionth of a quintillion, or one quadrillion times one thousand. The prefix "femto-" originates from the Danish word "femten," meaning fifteen.
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Yes, they all do have a four or a five
Nothing because the earth wouldn't be a thing, but if we're talking about everything (our universe, another universe) then I can guess that good old Elon Musk can fly a something and find another earth.