Il numero romano MCCCLXVI nel sistema decimale vale: 1366.
MCCCLXVI in latino si scrive mille trecenti sexaginta sex,
mentre in italiano milletrecentosessantasei.
MCCCXLVII, MCCCXLVIII, MCCCXLIX, MCCCL, MCCCLI, MCCCLII, MCCCLIII, MCCCLIV, MCCCLV, MCCCLVI, MCCCLVII, MCCCLVIII, MCCCLIX, MCCCLX, MCCCLXI, MCCCLXII, MCCCLXIII, MCCCLXIV, MCCCLXV, MCCCLXVII, MCCCLXVIII, MCCCLXIX, MCCCLXX, MCCCLXXI, MCCCLXXII, MCCCLXXIII, MCCCLXXIV, MCCCLXXV, MCCCLXXVI, MCCCLXXVII, MCCCLXXVIII, MCCCLXXIX, MCCCLXXX, MCCCLXXXI, MCCCLXXXII, MCCCLXXXIII, MCCCLXXXIV, MCCCLXXXV