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We study the reaction e+e- --> e+e- eta_c, eta_c --> K_S K+- pi-+ and obtain eta_c mass
and width values 2982.2+-0.4+-1.6 MeV/c^2 and 31.7+-1.2+-0.8 MeV, respectively. We find
Gamma(eta_c --> gamma gamma)B(eta_c --> K anti-K pi)=0.374+-0.009+-0.031 keV,
and measure the gamma gamma* --> eta_c transition form factor in the momentum transfer
range from 2 to 50 GeV^2. The analysis is based on 469 fb-1 of integrated luminosity
collected at PEP-II with the BABAR detector at e+e- center-of-mass energies
near 10.6 GeV.
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