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Assuming you are talking about whole numbers, 999999999999999999999 + 1 = 1000000000000000000000
No, 999999999999999999999 is not a prime number. A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. In this case, 999999999999999999999 can be divided by 3, 9, and other numbers, so it is not prime.
9,888,888,888,888,888,888,887
99999998900000001
There isn't one. Once I think of the highest number I can possibly think of, I immediately think "plus one" after that. Oops, I did it again.