55216553 has 8 divisors (see below), whose sum is σ = 63174720. Its totient is φ = 47275920.

The previous prime is 55216541. The next prime is 55216559. The reversal of 55216553 is 35561255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55216553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55216559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3263 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (7896840).

Almost surely, 2^55216553 is an apocalyptic number.

It is an amenable number.

55216553 is a deficient number, since it is larger than the sum of its proper divisors (7958167).

55216553 is a wasteful number, since it uses less digits than its factorization.

55216553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8767.

The product of its digits is 22500, while the sum is 32.

The square root of 55216553 is about 7430.7841443552. The cubic root of 55216553 is about 380.7937080595.

The spelling of 55216553 in words is "fifty-five million, two hundred sixteen thousand, five hundred fifty-three".