Thanks Sara. Glad I checked back in time to catch that.
And now that I've started on this topic, I'll also note that people make a lot of wrong guesses about gender, too.
http://www.nndc.bnl.gov/chart/reCenter.jsp?z=28&n=36
(look at Δ(MeV), the mass excess)
The binding energy per nucleon is lower, as the other guy points out, but that's the wrong metric because Cu-65 has one more nucleon. The free neutron coming in has zero binding energy.