Definitely not a golden barrel. It doesn't look too bad. If it were me, I'd simply let it callous over on its own, but if you're really worried, you could sprinkle cinnamon on the wound. Others will chime in shortly with their 2 cents.

Nancy

If I sprinkle cinnamon on the wound could it still heal on its own? Thank you

I would just leave it alone and let nature take it's course. It will callous over by itself.

I believe that your cactus is a trichocereus spachianus
push it back together and it will either heal with scarring or even pup (if your lucky : D ). If the vascular ring don't reconnectthe top piece may just dry up and fall off. Then your cactus will probably pup from the bottom. If you are really concerned about infection, you need to sprinkle some sulphur powder on the wound. You may want to keep the soil dry for a week or 2 (or all winter if you live somewhere cold) while the cactus recuperates.

Of course! These plants are MUCH tougher than you might think! :)

Nancy

I agree with sprinkling sulfur. It will scab over and heal just like that! Keep it dry! It's not a barrel cactus...maybe a cleistocactus. Does it have other stalks that stick up in a bunch of directions or is it just one stalk?

It is just one stalk with little pups around the bottom. I decided to leave it alone to heal by itself. The frayed parts have dried up and the middle of the wound is turning brown now. I am afraid to touch it becaise I dont want it to get infected. Is this normal? Is there something else I should do?

I would say this is Parodia leninghausii, sometimes known as Golden Ball cactus.

Christopher