One of the important ways in which the Higgs boson was detected at the Large Hadron Collider was by observing a type of decay in which the Higgs—which decays too quickly to be observed directly—is immediately transformed into two photons emitted back to back. Two photons, with momenta 3.31 × 10^-17 kg m/s, were detected. What is the mass of the Higgs boson? Give your answer as a multiple of the proton mass.