A gazillion; but that might be like the blonde joke where the blonde asks how many people are in a Brazilian when she hears about the Brazilian tragedy.
There’s no definite answer to this question. If we disregard infinity and just pick some arbitrarily large number, say, a googol, you could just consider to a googol to the googol power to the googol power to the googol power… it goes on forever.
No, “largest” means highest magnitude. 4 > pi. Pi is irrational, meaning its digits never repeat, but that doesn’t make it “larger”. For example, you can express the number 5 as 5.0, or 5.00000000000000000…. etc. The “length” of the number isn’t related to how “large” it is.
@Resistka good guess, and there was a website where you could put in your birthday (xx/xx/xxxx without the /) etc, and it would tell you where in Pi that string of numbers showed up.
The Highest Known Number Association (pronounced Hickna) will release a statement as soon as they are through counting. Progress has been encouraging. They report no fractions or irrational numbers have been encountered. The worst hazard for the Hickna membership has been the blisters on the tips of their fingers and tongue.
It would take too long to express in digits but in words it is “The number created when everybody else’s feeble attempts at suggesting the highest number are multiplied together and the digit 1 is added. And if some smarty pants is going to come up with an even higher number then I am just going to add another 1 to it so there.”
I think the next highest number, after n-plex (the proposed name for 10^googolplex or 10^10^10^100) should be Googol Bordello (you should start wearin’ purple!)