If the universe were packed solid with neutrons, say, so there was no empty space anywhere, there would still only be about 10128 particles in it, quite a bit more than a googol but trivially small compared to a googolplex.
a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol)
The largest named number A googol is 10 to the 100th power (1 followed by 100 zeros) A googolplex is 10 to the googol power (1 followed by a googol zeros) The estimated number of atoms in the universe is less than a googolplex In other words, there isn't enough matter in the universe to write a googolplex on