View Compilation Error

0_0_25766240_31654.cpp: In function 'ull phi(ull)':
0_0_25766240_31654.cpp:15:9: error: 'll' was not declared in this scope
     for(ll i = 2; i*i <= n; i++)
         ^
0_0_25766240_31654.cpp:15:19: error: 'i' was not declared in this scope
     for(ll i = 2; i*i <= n; i++)
                   ^