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Adding to Kai's answer, the input common-mode resistance may be calculated from the slope of the IB vs Vcm graph: Rcm=ΔVcm/ΔIB.
Unfortunately, the graph is not shown in the OPA735 datasheet; however, you may see the trend in another zero-drift product datasheet, OPA335, shown below. From the graph below one may calculate the Rcm to be between ~100G (1E+11) at 25C to Rcm=~3V/150pA=2G (2E+9) at 125C.