55216915 has 16 divisors (see below), whose sum is σ = 71533728. Its totient is φ = 40674816.

The previous prime is 55216883. The next prime is 55216919. The reversal of 55216915 is 51961255.

It is not a de Polignac number, because 55216915 - 2⁵ = 55216883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55216919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34779 + ... + 36331.

It is an arithmetic number, because the mean of its divisors is an integer number (4470858).

Almost surely, 2^55216915 is an apocalyptic number.

55216915 is a deficient number, since it is larger than the sum of its proper divisors (16316813).

55216915 is a wasteful number, since it uses less digits than its factorization.

55216915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 13500, while the sum is 34.

The square root of 55216915 is about 7430.8085024444. The cubic root of 55216915 is about 380.7945402195.

The spelling of 55216915 in words is "fifty-five million, two hundred sixteen thousand, nine hundred fifteen".