32
The largest 2 digit composite number is 99.
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
99
987654
32
99
It is 11.
The largest 2 digit composite number is 99.
99
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
A number is called a staircase composite number when it has three prime factors that have different sized digits: the first is one digit, the second is two digits and the third is three digits. For example: [7] [41] [271] x 77 777 77 777 would be the staircase composite number.
99
It is 97.
97
97
987654