18011618 has 8 divisors (see below), whose sum is σ = 27179712. Its totient is φ = 8951716.

The previous prime is 18011611. The next prime is 18011621. The reversal of 18011618 is 81611081.

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

It is not an unprimeable number, because it can be changed into a prime (18011611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26630 + ... + 27297.

It is an arithmetic number, because the mean of its divisors is an integer number (3397464).

Almost surely, 2^18011618 is an apocalyptic number.

18011618 is a deficient number, since it is larger than the sum of its proper divisors (9168094).

18011618 is a wasteful number, since it uses less digits than its factorization.

18011618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54096.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 18011618 is about 4244.0096606865. The cubic root of 18011618 is about 262.1305120599.

Adding to 18011618 its reverse (81611081), we get a palindrome (99622699).

The spelling of 18011618 in words is "eighteen million, eleven thousand, six hundred eighteen".