“If all the material in the universe...” Yeah, well. News flash: numbers are imaginary. No number needs to be written on a physical paper with physical ink. Aristotle knew this 340 BC. The largest number is reasonably theorized and fuzzily imagined.
It’s like helping Joe Sixpack understand the price of something by saying “dollar bills stacked to the moon.”
It is fascinating to say “there isn’t enough material in the universe to print out the biggest number.”