55 (number)

1

55 (fifty-five) is the natural number following 54 and preceding 56.

Mathematics

55 is the 10th Fibonacci number and the 10th triangular number, where 10 is the sum of 55's digits. It's the 5th heptagonal number, the 5th square pyramidal number, and the 4th centered nonagonal number. 55 is also the 15th squarefree semiprime, and the 19th semiprime, as well as the 32nd nontotient number (including odd numbers > 1), the 36th arithmetic number, the 38th composite number (where the abundance of 55 = - 38), the 43rd deficient number, the 45th trapezoidal number, and the 49th polite number.

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