I'm sure there are more than 2 prime numbers that are 400 digits long.
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There are 17 such numbers.
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
997 is the largest 3-digit prime number.