Il numero romano MMCLXXX nel sistema decimale vale: 2180.
MMCLXXX in latino si scrive duo milia centum octoginta,
mentre in italiano duemilacentottanta.
MMCLXI, MMCLXII, MMCLXIII, MMCLXIV, MMCLXV, MMCLXVI, MMCLXVII, MMCLXVIII, MMCLXIX, MMCLXX, MMCLXXI, MMCLXXII, MMCLXXIII, MMCLXXIV, MMCLXXV, MMCLXXVI, MMCLXXVII, MMCLXXVIII, MMCLXXIX, MMCLXXXI, MMCLXXXII, MMCLXXXIII, MMCLXXXIV, MMCLXXXV, MMCLXXXVI, MMCLXXXVII, MMCLXXXVIII, MMCLXXXIX, MMCXC, MMCXCI, MMCXCII, MMCXCIII, MMCXCIV, MMCXCV, MMCXCVI, MMCXCVII, MMCXCVIII, MMCXCIX