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# Are there any SI unit prefixes lower or higher than [unit^24]?

The highest I've heard of is yotta and lowest is yocto

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- mrjeffy321Lv 71 decade agoFavorite Answer
There is "googol" and "googolplex".

Googol = * 10^100, ten to the power of 100

Googolplex = * 10^(10^100), ten to the power of 1 googol

These extremely large metric/SI prefixes are not often used.

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