http://syncnotes.blogspot.ca/search?q=666
You can find that various numbers correspond to several things throughout history.
http://syncnotes.blogspot.ca/search?q=616 June 16= 6/16, but that doesn't mean its any more of a bad day than the 11th, 13th or the 31st of any month. However, when one takes a larger perspective of things, you just might see a pattern.