Y porque cargas ese numero?
Mas grande? si es de 32 bits tu plataforma no.Que procesador estan usando?.
Las operaciones con numeros de mas longitud requieren otro tipo de operaciones.
Edito.
Segun leo:
With the Pentium MMX, eight 64-bit MMX integer registers were added (MMX0 to MMX7, which share lower bits with the 80-bit-wide FPU stack).[18] With the Pentium III, a 32-bit Streaming SIMD Extensions (SSE) control/status register (MXCSR) and eight 128-bit SSE floating point registers (XMM0 to XMM7) were added.
Si hay registros mas grandes, pero no se usarlos!! xD
Saludos!