The number 617 is an integer that follows 616 and precedes 618. It is an odd number and can be expressed as the sum of two prime numbers, specifically 617 = 613 + 4. In mathematics, it is also classified as a composite number, as it has divisors other than 1 and itself. In the context of area codes, 617 is a telephone area code in the United States, primarily serving the city of Boston and some surrounding areas in Massachusetts. This area code was one of the original area codes established in 1947 and is known for its historical significance and vibrant culture.