55 (five) is a number, numeral and dit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. Humans, and many other animals, have 5 dits on their limbs. See moreCountdown Timer - The Countdown Timer part split out, just for you.; Large Stopwatch - Use the Stopwatch in FULL SCREEN. Great for meetings, classrooms, conferences, schools,