999
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898
997 is the largest 3-digit prime number.
1, 2, 3
Largest 4 digit number with repetition is 9999 Largest 3 digit number without repetition is 987 Difference is 9999 - 987 = 9012.
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.