Seventy-nine is prime and reduces to sixteen and then seven. It is one of the primes in the seventies that the symbolic traditions did not develop, and candour requires reporting that it carries no significant religious or mythic content. What can honestly be said of it is structural, it is prime, it is the sum of consecutive primes in more than one way, and none of this is lore.
Seventy-nine is prime, with no factors beyond one and itself. It has none of the more decorated properties, twin primeness, expressibility as a sum of two squares, that recreational number theory prizes in some of its neighbours, which makes it a plain prime rather than a celebrated one.
The whole apparatus of digit-reduction numerology is a twentieth-century invention rather than an inheritance from antiquity. Mrs. L. Dow Balliett published the first systematic version, The Philosophy of Numbers, in 1908, fixing the letter-to-number chart still used today and ruling that eleven and twenty-two must stand as master numbers rather than reduce further; her colleague, the physician Julia Seton, is credited with coining the word numerology itself around 1912.
A separate and older-claimed system, generally called Chaldean numerology, assigns letters to digits irregularly rather than in Balliett's repeating one-to-nine sequence, and deliberately omits nine from the chart as too sacred to attach to an ordinary letter; its popular billing as a genuinely ancient Babylonian system rests on assertion rather than on any textual evidence that has been traced back that far.