18323266820 has 12 divisors (see below), whose sum is σ = 38478860364. Its totient is φ = 7329306720.

The previous prime is 18323266811. The next prime is 18323266831. The reversal of 18323266820 is 2866232381.

It can be written as a sum of positive squares in 2 ways, for example, as 6438778564 + 11884488256 = 80242^2 + 109016^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 458081651 + ... + 458081690.

It is an arithmetic number, because the mean of its divisors is an integer number (3206571697).

Almost surely, 2^18323266820 is an apocalyptic number.

18323266820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18323266820 is an abundant number, since it is smaller than the sum of its proper divisors (20155593544).

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

18323266820 is a wasteful number, since it uses less digits than its factorization.

18323266820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916163350 (or 916163348 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

It can be divided in two parts, 183232 and 66820, that added together give a palindrome (250052).

The spelling of 18323266820 in words is "eighteen billion, three hundred twenty-three million, two hundred sixty-six thousand, eight hundred twenty".