Hmm... it doesn't quite look like a mite. Usually if anything is on them it would be mites.
Can you pull it off with a pair of tweezers? Or maby gently get it off?
Some insects and other living things sometimes hitch a ride on large beetles. It could be something organic, like a fungi or invertebrate (parasitic or not). Or could be something as simply as someone spilled something on the beetle.
It reminds me of the common pest, mealy bugs, but why would one be on a beetle?
I would just try to get it off the beetle and perhaps look underneath all the beetles also.