The largest three digit prime number whose digits are all primes is 773.
How about: 773
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
The largest 10-digit number with no digit repeated is 9876543210 !
You get the largest number if you sort the digits, from largest to smallest.
The largest digit is 9.
9876 is the largest four digit number you can make if all the digits must be different.
The largest number with three digits is 999.
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
Unless this is a trick question 9995 would be the largest 4 digit number with 5 as one of its digits
If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .If the same digit can't be used more than once, then the largest possible number has only10 digits. The number is 9,876,543,210 .
As a string, the largest number is 7111111.
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
How about: 97531