1000000000
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Prime factorization of 999999999 = 34 × 37 × 333667
Nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine
It has been proven that there is no largest prime number, and therefore there exists a prime number, in fact, infinitely many, greater than 10^999999999 (having a billion digits); however, no humans have actually found a specific number of that size and identified it as prime.
It depends upon the base of the number, but it is always one less than the base. For decimal numbers (base 10), our usual numbers, the largest digit that can be used in 10 - 1 = 9.
-999999999