55131618 has 8 divisors (see below), whose sum is σ = 110263248. Its totient is φ = 18377204.

The previous prime is 55131563. The next prime is 55131623. The reversal of 55131618 is 81613155.

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

55131618 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4594296 + ... + 4594307.

It is an arithmetic number, because the mean of its divisors is an integer number (13782906).

Almost surely, 2^55131618 is an apocalyptic number.

55131618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55131618 is a wasteful number, since it uses less digits than its factorization.

55131618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9188608.

The product of its digits is 3600, while the sum is 30.

The square root of 55131618 is about 7425.0668683858. The cubic root of 55131618 is about 380.5983601708.

The spelling of 55131618 in words is "fifty-five million, one hundred thirty-one thousand, six hundred eighteen".