Morbillion

1 Morbillion = 10^69420 (it has 69420 zeros)
Also known as the biggest number. It is estimated that it will be the last unit the humanity will use, the universe will explode by the time we'll need a new unit (aka 1000 Morbillions).
So far it has only been used to count how many tickets did the movie Morbius sell and how much money is in Jared Leto's bank account after he appeared in it.

A: Did you hear that Morbius sold 39 Morbillion tickets?
B: Yeah... and apparently Jared Leto made 69 Morbillion dollars for playing the doctor himself.
A: He totally deserves all the money. I wonder how many tickets will Morbius 2 sell?
B: idk but they'll probably have to create a new unit like KiloMorbillion or MegaMorbillion to count all of them.