My first cat, Sydney was deaf. He was all white with one blue eye and one green eye.
We started noticing when he was still a small kitten that he didn't react to loud noises. When he was asleep, you could snap your fingers or make any kind of noise that he would not wake up. His ears wouldn't even twitch.
I definitely agree with Spencer that your cat should be neutered and kept strictly indoors. Sydney was also normal in every way and he lived a happy, healthy life. Being deaf doesn't present any problems to an indoor cat. Sometimes you will even forget that he's deaf-it really will make no difference.
Just please keep him indoors.