lxiii

LXIII is the Roman numeral representing the integer 63. It is composed of L (50), X (10), and III (3), written as LXIII. The notation is additive, with no subtractive pair in this numeral, unlike combinations such as IV or IX.

63 corresponds to LXIII in Roman numerals. In other numeral systems, 63 equals 111111 in binary and 3F in hexadecimal.

Uses of LXIII appear in contexts where Roman numerals are employed for numbering or dating, such as chapter headings, section numbers, volume designations, monarch or pope lists, inscriptions on buildings and coins, or older manuscripts. In modern writing, years are typically given in Arabic numerals, but LXIII may still appear in ceremonial inscriptions or stylistic displays.

Mathematically, 63 is a composite number, equal to 3^2 × 7. It has divisors 1, 3, 7, 9, 21, and 63 and is the product of small primes.