18173444618 has 32 divisors (see below), whose sum is σ = 34421324544. Its totient is φ = 7011747072.

The previous prime is 18173444617. The next prime is 18173444647. The reversal of 18173444618 is 81644437181.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18173444617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1654505 + ... + 1665452.

It is an arithmetic number, because the mean of its divisors is an integer number (1075666392).

Almost surely, 2^18173444618 is an apocalyptic number.

18173444618 is a deficient number, since it is larger than the sum of its proper divisors (16247879926).

18173444618 is a wasteful number, since it uses less digits than its factorization.

18173444618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320006.

The product of its digits is 516096, while the sum is 47.

The spelling of 18173444618 in words is "eighteen billion, one hundred seventy-three million, four hundred forty-four thousand, six hundred eighteen".