853
this was a trick question...
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
997 is the largest 3-digit prime number.
You could say -9 or 0 for the smallest, depending on whether you want to include negative numbers or not. 9 would be the largest one digit number.
9
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
900 It is the only three digit number with a nine in the numbers place
9,876 since these are the largest single digit numbers that can be done without repeat.
There can only be one largest two-digit prime number.
The greatest sum of two two-digit numbers occurs when you add the largest two-digit numbers together. The largest two-digit number is 99. Therefore, the greatest sum of two two-digit numbers is 99 + 99, which equals 198.
874321 is the largest number made from all these digits.
52,355,500 is an eight-digit number.