18672432789 has 16 divisors (see below), whose sum is σ = 25504573952. Its totient is φ = 12144949488.

The previous prime is 18672432787. The next prime is 18672432791. The reversal of 18672432789 is 98723427681.

It is an interprime number because it is at equal distance from previous prime (18672432787) and next prime (18672432791).

It is not a de Polignac number, because 18672432789 - 2¹ = 18672432787 is a prime.

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 a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18672432787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31944 + ... + 195870.

It is an arithmetic number, because the mean of its divisors is an integer number (1594035872).

Almost surely, 2^18672432789 is an apocalyptic number.

It is an amenable number.

18672432789 is a deficient number, since it is larger than the sum of its proper divisors (6832141163).

18672432789 is a wasteful number, since it uses less digits than its factorization.

18672432789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164856.

The product of its digits is 8128512, while the sum is 57.

The spelling of 18672432789 in words is "eighteen billion, six hundred seventy-two million, four hundred thirty-two thousand, seven hundred eighty-nine".