Hummer scored nine points during a 17-5 run for the Tigers (11-7, 4-0) at the end of the first half that produced a 29-17 halftime advantage.
Princeton, which shot 54.8 percent (23 of 42) and made 8 of 13 from 3-point range, never led by fewer than 12 in the second half.
Koon and T.J. Bray, who finished with 14 points, each made 6 of 7 shots for Princeton, and Hummer was 6 of 10.
Hummer now has 1,455 career points, good for fourth on Princeton's all-time list. He passed Craig Robinson, the brother-in-law of President Obama, who had been fifth, and Pete Campbell.
Rafael Maia scored 19 points for the Bears (8-11, 2-3), who shot 38 percent (19 of 50), including 1 of 12 on 3-pointers.
SMU has signed a second player from Australia, 6-foot-11 forward Harry Froling, to a national letter of intent. The Mustangs previously signed guard Tom Wilson from Australia.
There's nothing to suggest the Jayhawks won't end up atop the Big 12 for a 13th season in a row. But what about a return to the Final Four?
Colorado State graduate transfer John Gillon has chosen Syracuse, giving the Orange a potential starter at point guard entering the 2016-17 season.