Hello Mpenf7!
The largest named number in the world is a googolplexian. Because numbers are infinite, and any number can be made larger by simply adding to it, the largest number in the world is defined as the largest number that has a name.
A googolplexian is described as a “1” with a googolplex of zeroes following it. A googolplex is described as a “1” with a googol zeroes behind it. A googol is equal to a “1” with 100 zeroes following it. Most of these numbers are too large to have any value in equations, and they are rarely, if ever, used by mathematicians.
Hope this Helps! Have A Wonderful Day! :)