VMS Help CC, Messages, INTCONSTTOOBIG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        This integer constant is too large for the long long
                type.  It will be given the unsigned long long type.

 Description    The C99 standard specifies that a decimal constant
                must fit in a signed type.  This constant is too
                large for the long long int type.  For compatibility
                with older versions of the compiler, the constant
                will be given the unsigned long long type.

 User Action    Append a 'U' suffix to the constant.  This will force
                it to be unsigned.