Something

#include <stdio.h>
#include <stdlib.h>

int main(void){
               long long int input = 317584931803LL;
               int c = 0; int fino = 0;
               while(c != input){
                           if((input % c) == 0 && fino < c){
                                     fino = c;
                           }
                           ++c;            
               }
               system("PAUSE");
               return 0;
}