A ridiculously, obscenely huge number which is so vastly, mind-boggling big that you should probably don protective gear before evoking it. It can also be described as "insanity times infinity plus one".
There is not a googleplex of anything in the known Universe or any other universe. Perhaps of you were to add up all the atoms in all parallel universes in all dimensions of existence and then raise that to the power of itself, you might begin to approach a fraction of a percent of a googleplex.
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