Six may be a "
perfect number" mathematically, but there is an equal body of tradition indicating it as a number of
evil. To
Christian numerologists,
seven is a number of
God and
perfection. As six falls one short of seven, it stands for
imperfection and thus
sin or
Satan. Get too many of these together and you get
666.
At the same time, six counts the points of the hexagram (whether you take it straight or with a twist) and the sephiroth of Microprosopus, so it can't be all that terrible, ne?