18081618 has 16 divisors (see below), whose sum is σ = 37330176. Its totient is φ = 5832720.

The previous prime is 18081607. The next prime is 18081619. The reversal of 18081618 is 81618081.

It is not an unprimeable number, because it can be changed into a prime (18081619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48421 + ... + 48792.

It is an arithmetic number, because the mean of its divisors is an integer number (2333136).

Almost surely, 2^18081618 is an apocalyptic number.

18081618 is an abundant number, since it is smaller than the sum of its proper divisors (19248558).

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

18081618 is a wasteful number, since it uses less digits than its factorization.

18081618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97249.

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 18081618 is about 4252.2485816330. The cubic root of 18081618 is about 262.4696527276.

Adding to 18081618 its reverse (81618081), we get a palindrome (99699699).

The spelling of 18081618 in words is "eighteen million, eighty-one thousand, six hundred eighteen".