18534665389 has 4 divisors (see below), whose sum is σ = 18848812320. Its totient is φ = 18220518460.

The previous prime is 18534665381. The next prime is 18534665431. The reversal of 18534665389 is 98356643581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18534665389 - 2³ = 18534665381 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 (18534665381) by changing a digit.

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, 157073377 + ... + 157073494.

It is an arithmetic number, because the mean of its divisors is an integer number (4712203080).

Almost surely, 2^18534665389 is an apocalyptic number.

It is an amenable number.

18534665389 is a deficient number, since it is larger than the sum of its proper divisors (314146931).

18534665389 is an equidigital number, since it uses as much as digits as its factorization.

18534665389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314146930.

The product of its digits is 18662400, while the sum is 58.

The spelling of 18534665389 in words is "eighteen billion, five hundred thirty-four million, six hundred sixty-five thousand, three hundred eighty-nine".