199
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19 is a prime number, but it is not a factor of 200.
Prime factorization of 200 = 2x2x2x5x5
85 is not a prime number as it is divisible by 5. Anything that ends with 5 is divisible by 5. The nearest prime number to 85 is 83 or 87.
200 is divisible by 2, among other numbers, therefore it can not be a prime number.
The greatest prime number less than 200 is 199.