Why $666 a month? Here's the numerology behind it: In numerology, 666 is seen as a number set that points to abundance, luck and optimism. This is because once all three numbers are added, the resultant number, a 9, is viewed as one of selflessness as well as the pursuit of a quality life. People who tend to see this number are more likely than others to get involved in giving items as well as any other resources to charitable organizations. In addition, 666 can make you become more tolerant of differences with regard to the views of other people and cultures.