The number of universes in the multiverse* is at least 10^10^10^7, based on quantum fluctuations in the state of the early universe being “frozen” during inflation, say Andrei Linde and Vitaly Vanchurin at Stanford University.

But the total amount of information that can be absorbed by one individual during a lifetime is about 10^16 bits, so a typical human brain can have 10^10^16 configurations and could never distinguish more than that number of different universes, they add.

* The hypothetical set of possible multiple universes