There's no largest number, according to the rules of Pi aka π, there's always more, countless and LARGEST NUMBERS.
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The largest real number that has been named is googolplex. What about 10^googolplex or googolplex^googolplex? The answer comes from the theory of non-computable functions. Scott Aaronson from MIT has a brilliant essay about it. See below for related link
grahams largest number is 92
the largest odd number is 9
The largest named number that is commonly known is a googolplex. A googol is 10^100 (a one with 100 zeros after it) and a googolplex is 10^googol. Under the traditional naming system of million, billion, trillion, the largest named number is Centillion, which is 10^303 (a one with 303 zeros after it). The largest denomination banknote ever printed was for 1 sextillion (10^21). In science, some large numbers used are Avogadro's number (6.022 x 10^23), which defines the number of molecules in a mole; Graham's number (unimaginably large), which is the upper bound of connections between vertices of hypercubes.
The largest number that will divide into any number evenly is the number itself.