Il numero romano MCCLVI nel sistema decimale vale: 1256.
MCCLVI in latino si scrive mille ducenti quinquaginta sex,
mentre in italiano milleduecentocinquantasei.
MCCXXXVII, MCCXXXVIII, MCCXXXIX, MCCXL, MCCXLI, MCCXLII, MCCXLIII, MCCXLIV, MCCXLV, MCCXLVI, MCCXLVII, MCCXLVIII, MCCXLIX, MCCL, MCCLI, MCCLII, MCCLIII, MCCLIV, MCCLV, MCCLVII, MCCLVIII, MCCLIX, MCCLX, MCCLXI, MCCLXII, MCCLXIII, MCCLXIV, MCCLXV, MCCLXVI, MCCLXVII, MCCLXVIII, MCCLXIX, MCCLXX, MCCLXXI, MCCLXXII, MCCLXXIII, MCCLXXIV, MCCLXXV