Il numero romano MMMMCLXXX nel sistema decimale vale: 4180.
MMMMCLXXX in latino si scrive quattuor milia centum octoginta,
mentre in italiano quattromilacentottanta.
MMMMCLXI, MMMMCLXII, MMMMCLXIII, MMMMCLXIV, MMMMCLXV, MMMMCLXVI, MMMMCLXVII, MMMMCLXVIII, MMMMCLXIX, MMMMCLXX, MMMMCLXXI, MMMMCLXXII, MMMMCLXXIII, MMMMCLXXIV, MMMMCLXXV, MMMMCLXXVI, MMMMCLXXVII, MMMMCLXXVIII, MMMMCLXXIX, MMMMCLXXXI, MMMMCLXXXII, MMMMCLXXXIII, MMMMCLXXXIV, MMMMCLXXXV, MMMMCLXXXVI, MMMMCLXXXVII, MMMMCLXXXVIII, MMMMCLXXXIX, MMMMCXC, MMMMCXCI, MMMMCXCII, MMMMCXCIII, MMMMCXCIV, MMMMCXCV, MMMMCXCVI, MMMMCXCVII, MMMMCXCVIII, MMMMCXCIX