It's not a cactus. It's Euphorbia trigona. Eventually it will hit the ceiling. Beware of the white milk he bleeds when damaged; it's poisonous. Harry

I am not familiar with every form of E trigonia. I agree with Harry it is an Euphorbia [African cactus if you like] and it certainly looks like a trigona but....
the leaves look a little large to me.

Baldric

How well does this propagate? And what temperatures can it tolerate?

Here's where to get all the info you need..

Search the site below for a plant that looks similar to yours then read all the info... it's a very comprehensive source...

Here is a link that might be useful: Sukkulente Euphorbien