One Hundred Sixty Three is a natural number that follows one hundred sixty-two and precedes one hundred sixty-four. It is an odd number and can be expressed in Roman numerals as CLXIII. In mathematics, it is considered a composite number, as it has divisors other than one and itself. In various contexts, the number 163 can hold significance. For example, in science, it is the atomic number of dysprosium, a rare earth element. In history, the year 163 AD was marked by notable events, including the reign of Roman Emperor Marcus Aurelius.