The largest three digit Prime number whose digits are all primes is 773.
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The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
The largest ten digit number with no repeated digits is '9876543210'.
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987
You get the largest number if you sort the digits, from largest to smallest.
9876 is the largest four digit number you can make if all the digits must be different.