Someone is using a bitcoin account to blackmail me
Blackmail should be reported to your local police.

This is a question and answer website where ordinary people like you and I share helpful information on a voluntary basis. We don't run bitcoin (no one does).

The number is not an account number, it is a bitcoin address. Those are not really traceable to any specific person, computer or place. People like the FBI may be able to eventually track down criminals using bitcoin on a large scale but we can't.