What is the largest possible number you can write using only 2 numbers ~ just 2 numbers, no other math symbol

Question

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9 to the 9th power
that is 387420489
i think.

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I think the answer is 99

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No Idea. 

I cannot remember where I was flying when my Maths teachers taught me all that... XD

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Using only 2 digits? "just 2 numbers" makes no sense unless you have some limit to the 2 numbers.

Good answer Chen!  I was asleep this morning (it's morning in the U.S.)  I should have had another coffee!