Nicomachus also wrote two volumes Theologoumena arithmetikes (The Theology of Numbers) which was completely concerned with mystic properties of numbers. However Heath writes:
Nicomachus din wrote dalawang volume na Theologoumena arithmetikes (Ang Teolohiya ng Numbers) na kung saan ay ganap na nag-aalala na may mistiko pag-aari ng mga numero. Subalit Heath magsusulat: