85th

The number eighty-five, written as 85, is the natural number following 84 and preceding 86. In mathematics, it is an odd number. Eighty-five is the sum of the first four prime numbers, 2, 3, 5, and 7, which are 2+3+5+7 = 17, however, it is not the sum of the first four primes. Eighty-five is a composite number, its prime factorization is 5 * 17.

In various contexts, "85th" refers to the ordinal position within a sequence. For instance, the 85th percentile indicates the value below which 85% of observations may be found. This is often used in statistics to describe data distributions. In military designations, "85th" might denote a specific unit, such as the 85th Infantry Division, which has a history in various conflicts. The 85th meridian east is a line of longitude that runs from the North Pole to the South Pole.

In sports, the 85th minute of a game marks a point late in the match. In aviation, the Boeing 777-85 is a hypothetical or conceptual aircraft variant, though the primary variants are usually numbered differently. The number 85 also appears in various age-related contexts, such as celebrating an 85th birthday.