999
The largest three digit prime number whose digits are all primes is 773.
They are: 83, 89 and 97
995
252
999
999.
The largest three digit prime number whose digits are all primes is 773.
997 is the highest number.It is 997.
269
101 997
961
They are: 83, 89 and 97
How about: 773
995
800 2x2x2x2x2x5x5
252