In today's modern notation of Roman numerals MCMLXVI is the equivalent of 1966 but the ancient Romans would have probably notated it quite differently.
1971
In modern terms it is: June-XIV-MCMLXVI or as VI-XIV-MCMLXVI
1966
The number 1966 (nineteen sixty six) in Roman numerals is MCMLXVI
1966 m = 1000 cm = 900 lx = 60 vi = 6 mcmlxvi = 1966
1971
In modern terms it is: June-XIV-MCMLXVI or as VI-XIV-MCMLXVI
MCMLXVI
1966
The number 1966 (nineteen sixty six) in Roman numerals is MCMLXVI
1966 m = 1000 cm = 900 lx = 60 vi = 6 mcmlxvi = 1966
XXIV IX MCMLXVI
1966- mcmlxvi
VIII/XXII/MCMLXVI
V-XIX-MCMLXVI
In today's terms: XVI-IV-MCMLXVI
In today's notation of Roman numerals it represents 1966