Infinity.
Infinity is not a finite number, and hence is not the largest number theoretically. Several large numbers exist, such as Googol and Googolplex. But the largest of them all is the - Graham's number.
It is so large that you cannot write simply by the means of exponentiation or tetration.
Source - http://en.wikipedia.org/wiki/Graham's_number
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grahams largest number is 92
the largest odd number is 9
There are one hundred zeros in a googolplex. This is the largest number in the entire world with a name.
The largest number that will divide into any number evenly is the number itself.