Who called from 8574445661

Just another in a host of numbers that crop up on my caller ID slot all day, every day.  There's no response when I answer - just phone static.

Computer said
"You are technically the only person on this conference call" then it was dead air
called back got message "all circuits are busy"

also got few phone calls but no answer

Just a call from this number. Oddly, my phone showed that it was my brother calling me, yet the number didn't match his. When I answered, the call immediately ended.

Just got call from this number. As i call back, it hanged up itself then minutes later got another call, same thing again. Number was 8566578169.