Il numero romano CCLVII nel sistema decimale vale: 257.
CCLVII in latino si scrive ducenti quinquaginta septem,
mentre in italiano duecentocinquantasette.
CCXXXVIII, CCXXXIX, CCXL, CCXLI, CCXLII, CCXLIII, CCXLIV, CCXLV, CCXLVI, CCXLVII, CCXLVIII, CCXLIX, CCL, CCLI, CCLII, CCLIII, CCLIV, CCLV, CCLVI, CCLVIII, CCLIX, CCLX, CCLXI, CCLXII, CCLXIII, CCLXIV, CCLXV, CCLXVI, CCLXVII, CCLXVIII, CCLXIX, CCLXX, CCLXXI, CCLXXII, CCLXXIII, CCLXXIV, CCLXXV, CCLXXVI