The number 166 is an integer that follows 165 and precedes 167. It is an even number, meaning it is divisible by 2 without a remainder. In mathematics, 166 can be expressed as the sum of two prime numbers, specifically 83 + 83. In terms of its significance, 166 is often used in various contexts, such as in numerology or as a reference number in scientific studies. It can also represent a specific year, such as AD 166, which was notable for events in Roman history.