Il numero romano MMCDLVI nel sistema decimale vale: 2456.
MMCDLVI in latino si scrive duo milia quadringenti quinquaginta sex,
mentre in italiano duemilaquattrocentocinquantasei.
MMCDXXXVII, MMCDXXXVIII, MMCDXXXIX, MMCDXL, MMCDXLI, MMCDXLII, MMCDXLIII, MMCDXLIV, MMCDXLV, MMCDXLVI, MMCDXLVII, MMCDXLVIII, MMCDXLIX, MMCDL, MMCDLI, MMCDLII, MMCDLIII, MMCDLIV, MMCDLV, MMCDLVII, MMCDLVIII, MMCDLIX, MMCDLX, MMCDLXI, MMCDLXII, MMCDLXIII, MMCDLXIV, MMCDLXV, MMCDLXVI, MMCDLXVII, MMCDLXVIII, MMCDLXIX, MMCDLXX, MMCDLXXI, MMCDLXXII, MMCDLXXIII, MMCDLXXIV, MMCDLXXV