Il numero romano CCLXI nel sistema decimale vale: 261.
CCLXI in latino si scrive ducenti sexaginta unus,
mentre in italiano duecentosessantuno.
CCXLII, CCXLIII, CCXLIV, CCXLV, CCXLVI, CCXLVII, CCXLVIII, CCXLIX, CCL, CCLI, CCLII, CCLIII, CCLIV, CCLV, CCLVI, CCLVII, CCLVIII, CCLIX, CCLX, CCLXII, CCLXIII, CCLXIV, CCLXV, CCLXVI, CCLXVII, CCLXVIII, CCLXIX, CCLXX, CCLXXI, CCLXXII, CCLXXIII, CCLXXIV, CCLXXV, CCLXXVI, CCLXXVII, CCLXXVIII, CCLXXIX, CCLXXX