18520290618 has 8 divisors (see below), whose sum is σ = 37040581248. Its totient is φ = 6173430204.

The previous prime is 18520290589. The next prime is 18520290623. The reversal of 18520290618 is 81609202581.

It is a happy number.

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

18520290618 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18520290618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1543357546 + ... + 1543357557.

It is an arithmetic number, because the mean of its divisors is an integer number (4630072656).

Almost surely, 2^18520290618 is an apocalyptic number.

18520290618 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.

18520290618 is a wasteful number, since it uses less digits than its factorization.

18520290618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086715108.

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 18520290618 in words is "eighteen billion, five hundred twenty million, two hundred ninety thousand, six hundred eighteen".