Il numero romano MMMCMLXVI nel sistema decimale vale: 3966.
MMMCMLXVI in latino si scrive tria milia nongenti sexaginta sex,
mentre in italiano tremilanovecentosessantasei.
MMMCMXLVII, MMMCMXLVIII, MMMCMXLIX, MMMCML, MMMCMLI, MMMCMLII, MMMCMLIII, MMMCMLIV, MMMCMLV, MMMCMLVI, MMMCMLVII, MMMCMLVIII, MMMCMLIX, MMMCMLX, MMMCMLXI, MMMCMLXII, MMMCMLXIII, MMMCMLXIV, MMMCMLXV, MMMCMLXVII, MMMCMLXVIII, MMMCMLXIX, MMMCMLXX, MMMCMLXXI, MMMCMLXXII, MMMCMLXXIII, MMMCMLXXIV, MMMCMLXXV, MMMCMLXXVI, MMMCMLXXVII, MMMCMLXXVIII, MMMCMLXXIX, MMMCMLXXX, MMMCMLXXXI, MMMCMLXXXII, MMMCMLXXXIII, MMMCMLXXXIV, MMMCMLXXXV