View Compilation Error

0_0_29970134_23812.cpp: In function 'bool isprime(__int128)':
0_0_29970134_23812.cpp:17:32: error: call of overloaded 'sqrt(__int128&)' is ambiguous
     __int128 t=(__int128)sqrt(x);
                                ^
0_0_29970134_23812.cpp:17:32: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from 0_0_29970134_23812.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:152:18: note: double sqrt(double)
   double __cdecl sqrt(double _X);
                  ^
In file included from 0_0_29970134_23812.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:486:3: note: constexpr long double std::sqrt(long double)
   sqrt(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:482:3: note: constexpr float std::sqrt(float)
   sqrt(float __x)
   ^