Il numero romano MMMMCMLXXX nel sistema decimale vale: 4980.
MMMMCMLXXX in latino si scrive quattuor milia nongenti octoginta,
mentre in italiano quattromilanovecentottanta.
MMMMCMLXI, MMMMCMLXII, MMMMCMLXIII, MMMMCMLXIV, MMMMCMLXV, MMMMCMLXVI, MMMMCMLXVII, MMMMCMLXVIII, MMMMCMLXIX, MMMMCMLXX, MMMMCMLXXI, MMMMCMLXXII, MMMMCMLXXIII, MMMMCMLXXIV, MMMMCMLXXV, MMMMCMLXXVI, MMMMCMLXXVII, MMMMCMLXXVIII, MMMMCMLXXIX, MMMMCMLXXXI, MMMMCMLXXXII, MMMMCMLXXXIII, MMMMCMLXXXIV, MMMMCMLXXXV, MMMMCMLXXXVI, MMMMCMLXXXVII, MMMMCMLXXXVIII, MMMMCMLXXXIX, MMMMCMXC, MMMMCMXCI, MMMMCMXCII, MMMMCMXCIII, MMMMCMXCIV, MMMMCMXCV, MMMMCMXCVI, MMMMCMXCVII, MMMMCMXCVIII