The smallest possibility is 1 x (1 googol)(500 millionth power)
It has not been anywhere near that number of nanoseconds since the Big Bang.
There are nowhere near that many cubic nanometers of volume in the observable universe.
In fact, there are nowhere near that many protons, neutrons, electrons, and neutrinos,
all combined, in the universe.
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In 90 billion, there are 9 zeros. This is because a billion has 9 zeros (1,000,000,000), and when you multiply 90 by a billion, you get 90 billion, which retains the 9 zeros from the billion.
100 billion = 100,000,000,000This is 11 zeros
a billion has nine zeros.
9 zeros
A billion (or 6 billion) has 9 zeros.