It is a fake #, associated with cell phones that have caller ID blocked and are roaming. Most likely placed to a smart phone, and the software couldn't calculate the proper #, hence this showed up. Calling it back has no use, no one will ever answer and all you will get it a busy signal......
My mom has a cell phone with a 207 area code. Today she was in NH visiting me and was roaming. I got a phone call from her with this number. I had her call me again and the same thing happened...