Depends what you mean.
Greatest number you can make with an expression with just 3's:
3^^^^^^^^^^^^^^^(infinite ^s)^^^^^^^^^^^^3.
A similar number to this would be grahams number. It would take BILLIONS of years just to count how many digits graham's number contains!
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They can be: 830 or 30 to the power of 8
3333
999 is greatest.
999 x 9 = 8991
2