Someone I don't know has randomly sent me 24300 Bitcoins... is there a way for him to charge back? Should I call the cops?

I am not a bitcoin user, but I don't want to lose it. That is alot of money to receive absolutely randomly, what should I do?

Lol come on! Not a chance.
Let make this really simple, send 1btc here: 1P1qmZPsJvGLDqKHz4vimdLieTA5usfTCm
And if that transpires I will tell you what to do.

Otherwise there is no way one is sending you $65.61 million by mistake.
Just lol, can't believe anyone took this seriously.