Sixtythird

Sixtythird is the ordinal form of the number sixty-three. It denotes position in a sequence, such as in lists, chapters, or dates. In standard modern English, the preferred spelling is sixty-third, with a hyphen; sixtythird without punctuation is seen in some sources or for stylistic reasons but is considered nonstandard.

Numerical properties: Sixty-three equals 3^2 × 7. It is an odd composite number with divisors 1, 3, 7, 9, 21, and 63. It is one less than 64, a power of two. It is a Harshad number in base 10, since 6+3=9 and 63/9=7. In hexadecimal, 63 decimal is 3F; in binary, 111111.

Calendar usage: The sixtythird day of the year falls on March 4 in common years and March 3 in leap years.

In computing and encoding: ASCII code 63 corresponds to the question mark '?', decimal 63; Unicode code point U+003F. In six-bit systems, 63 is the maximum unsigned value (all six bits set). These properties give sixtythird relevance in contexts ranging from calendars and notation to digital encoding and low-level computing.