This is a white flowered variety of Kalanchoe.
May be a named variety, but I assume something like this in flower:
https://islingtongardencentre.com/product/kalanchoe-white-4-inch/
It's an easy going succulent that likes hot sun and copes very well with neglect: as with all succulents its thick fleshy leaves and stem store water in case of hard times.
You could put it outside for a summer holiday in your garden and it will love this hot summer we seem to be having, but you'd need to take it in for the winter or it would be killed by the cold weather. Most people keep them inside all year round.
These are propagated from cuttings from a plant I grew from a tiny cutting given to me last year by another kind freecycler. So these are 3rd generation descendents.