55518915 has 16 divisors (see below), whose sum is σ = 88962048. Its totient is φ = 29566176.

The previous prime is 55518913. The next prime is 55518919. The reversal of 55518915 is 51981555.

It is not a de Polignac number, because 55518915 - 2¹ = 55518913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55518913) 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, 9454 + ... + 14156.

It is an arithmetic number, because the mean of its divisors is an integer number (5560128).

Almost surely, 2^55518915 is an apocalyptic number.

55518915 is a deficient number, since it is larger than the sum of its proper divisors (33443133).

55518915 is a wasteful number, since it uses less digits than its factorization.

55518915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498.

The product of its digits is 45000, while the sum is 39.

The square root of 55518915 is about 7451.1015964084. The cubic root of 55518915 is about 381.4875098043.

The spelling of 55518915 in words is "fifty-five million, five hundred eighteen thousand, nine hundred fifteen".