Il numero romano MMMMDCLXI nel sistema decimale vale: 4661.
MMMMDCLXI in latino si scrive quattuor milia sescenti sexaginta unus,
mentre in italiano quattromilaseicentosessantuno.
MMMMDCXLII, MMMMDCXLIII, MMMMDCXLIV, MMMMDCXLV, MMMMDCXLVI, MMMMDCXLVII, MMMMDCXLVIII, MMMMDCXLIX, MMMMDCL, MMMMDCLI, MMMMDCLII, MMMMDCLIII, MMMMDCLIV, MMMMDCLV, MMMMDCLVI, MMMMDCLVII, MMMMDCLVIII, MMMMDCLIX, MMMMDCLX, MMMMDCLXII, MMMMDCLXIII, MMMMDCLXIV, MMMMDCLXV, MMMMDCLXVI, MMMMDCLXVII, MMMMDCLXVIII, MMMMDCLXIX, MMMMDCLXX, MMMMDCLXXI, MMMMDCLXXII, MMMMDCLXXIII, MMMMDCLXXIV, MMMMDCLXXV, MMMMDCLXXVI, MMMMDCLXXVII, MMMMDCLXXVIII, MMMMDCLXXIX, MMMMDCLXXX