It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten digit numbers.
But I also knows how many of these numbers are prime, Do you ?
The summation of numbers from 0 to 9 is 45 and can be divisible by 3 and 9.
What is the product of two largest three digit prime numbers which have 3 in their unit place?
Note: Two largest = Largest and second largest
All the digits of the given number are different.