With regard to your post:
"I will be 65 years old in July 2016. My husband died October 4, 2014 ---- I am sorry for your loss.
"and was receiving disability. He was 64 when he died. I am still full time employed. Can I apply for my husband's social security while I am still employed (my salary is 64,500/year). ------- It is unlikely that at $64,500/year, you will have any Survivor benefit to take, because of the earnings limit for dependent benefits, for those of us under our full retirement age (FRA). However, once you are 66 (FRA), you are no longer subject to the earnings limit so you can work and collect a 100% on that survivor benefit.
"Should I consider retiring at the end of this year and then draw his social security? ----- If you mean retire as in collect, for survivor, yes, as there is no benefit to waiting passed 66 (FRA) for survivor. But that doesn't mean you have to stop working - imagine all that nest egg you can save up so when you Do stop working, you can really have some fun (or security, depending on your wants/needs).
"I know that my FRA is 66 but I would like to retire sooner." ----- Ah, OK, if you do wish to stop working, yes, full survivor at 66. If you can survive on it. And you will also want to determine, regardless, what your OWN benefit will be at 66 and at 70. Is your own benefit at 70, which is 32% bigger than if you started it at 66, bigger than your survivor benefit? If so, consider survivor from 66 to 70, then switch to your own, the highest.