18131084388618 has 16 divisors (see below), whose sum is σ = 36289619337216. Its totient is φ = 6039119702880.

The previous prime is 18131084388611. The next prime is 18131084388643. The reversal of 18131084388618 is 81688348013181.

It is a super-2 number, since 2×18131084388618² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18131084388611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1143764746 + ... + 1143780597.

It is an arithmetic number, because the mean of its divisors is an integer number (2268101208576).

Almost surely, 2^{18131084388618} is an apocalyptic number.

18131084388618 is an abundant number, since it is smaller than the sum of its proper divisors (18158534948598).

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

18131084388618 is a wasteful number, since it uses less digits than its factorization.

18131084388618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287546669.

The product of its (nonzero) digits is 7077888, while the sum is 60.

The spelling of 18131084388618 in words is "eighteen trillion, one hundred thirty-one billion, eighty-four million, three hundred eighty-eight thousand, six hundred eighteen".