18220259618 has 18 divisors (see below), whose sum is σ = 30044303793. Its totient is φ = 8280981720.

The previous prime is 18220259569. The next prime is 18220259639. The reversal of 18220259618 is 81695202281.

It can be written as a sum of positive squares in 2 ways, for example, as 17126171689 + 1094087929 = 130867^2 + 33077^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95447.

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 2095496 + ... + 2104172.

Almost surely, 2^18220259618 is an apocalyptic number.

18220259618 is a deficient number, since it is larger than the sum of its proper divisors (11824044175).

18220259618 is an frugal number, since it uses more digits than its factorization.

18220259618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17378 (or 8690 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 18220259618 in words is "eighteen billion, two hundred twenty million, two hundred fifty-nine thousand, six hundred eighteen".