18431440933 has 8 divisors (see below), whose sum is σ = 18610158168. Its totient is φ = 18253553664.

The previous prime is 18431440921. The next prime is 18431440939. The reversal of 18431440933 is 33904413481.

It can be written as a sum of positive squares in 4 ways, for example, as 15539367649 + 2892073284 = 124657^2 + 53778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18431440933 - 2¹³ = 18431432741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431440939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162816 + ... + 251737.

It is an arithmetic number, because the mean of its divisors is an integer number (2326269771).

Almost surely, 2^18431440933 is an apocalyptic number.

It is an amenable number.

18431440933 is a deficient number, since it is larger than the sum of its proper divisors (178717235).

18431440933 is a wasteful number, since it uses less digits than its factorization.

18431440933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414983.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 18431440933 in words is "eighteen billion, four hundred thirty-one million, four hundred forty thousand, nine hundred thirty-three".