The Coulomb interaction U0 between two electrons on the same C60 molecule has been estimated from self-consistent calculations for a free C60 molecule with different number of electrons ( Phys. Rev. B 46, 13647 (1992)). To obtained the Coulomb interaction U appropriate for a solid, the reduction of U0 due to the polarization of the neighboring molecules has been calculated. Also the nearest neighbor Coulomb interaction was obtained. U has also been studied for C60, K3C60and K6C60 by comparing Auger and photoemission spectra. ( Phys. Rev. B 48, 18296 (1993)).