655 = 5 x 131.
655 is a semiprime (product of two prime numbers) that is the product of two Sophie Germain primes, 5 and 131.
655 is a number that cannot be written as a sum of three squares.
655 is a divisor of 615 - 1.
655 is 22033 in base 4 and 10110 in base 5.
Iran Air Flight 655 was an airliner shot down by U.S. missiles in 1988 toward the end of the Iran-Iraq war.
