18365856546 has 32 divisors (see below), whose sum is σ = 38572921728. Its totient is φ = 5818475520.

The previous prime is 18365856499. The next prime is 18365856557. The reversal of 18365856546 is 64565856381.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402175 + ... + 445506.

It is an arithmetic number, because the mean of its divisors is an integer number (1205403804).

Almost surely, 2^18365856546 is an apocalyptic number.

18365856546 is an abundant number, since it is smaller than the sum of its proper divisors (20207065182).

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

18365856546 is a wasteful number, since it uses less digits than its factorization.

18365856546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847866.

The product of its digits is 20736000, while the sum is 57.

The spelling of 18365856546 in words is "eighteen billion, three hundred sixty-five million, eight hundred fifty-six thousand, five hundred forty-six".