18264544821 has 16 divisors (see below), whose sum is σ = 27063472320. Its totient is φ = 12174163920.

The previous prime is 18264544801. The next prime is 18264544871. The reversal of 18264544821 is 12844546281.

18264544821 is a `hidden beast` number, since 1 + 8 + 26 + 4 + 544 + 82 + 1 = 666.

It is not a de Polignac number, because 18264544821 - 2⁶ = 18264544757 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18264544801) 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, 98766 + ... + 215136.

It is an arithmetic number, because the mean of its divisors is an integer number (1691467020).

Almost surely, 2^18264544821 is an apocalyptic number.

It is an amenable number.

18264544821 is a deficient number, since it is larger than the sum of its proper divisors (8798927499).

18264544821 is a wasteful number, since it uses less digits than its factorization.

18264544821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122193 (or 122187 counting only the distinct ones).

The product of its digits is 491520, while the sum is 45.

The spelling of 18264544821 in words is "eighteen billion, two hundred sixty-four million, five hundred forty-four thousand, eight hundred twenty-one".