Private number. May either be a prank call, or a wrong number call. I hung up without responding. What was said, would indicate "prank" unless person simply dialed wrong without realising it. Person did not call back.
Any caller or texter who cannot leave a message is not worth spending money nor time on. This number goes on the block list, which is likely the same party who calls with other 510-910 numbers. Need a new game, Slowbrain.
When I answer my phone & say "Hello" about 3 / 4 times & they still won't say anything , I just Hang up !