18660439869 has 8 divisors (see below), whose sum is σ = 24895050432. Its totient is φ = 12433061280.

The previous prime is 18660439867. The next prime is 18660439877. The reversal of 18660439869 is 96893406681.

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

It is not a de Polignac number, because 18660439869 - 2¹ = 18660439867 is a prime.

It is a super-2 number, since 2×18660439869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18660439867) 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, 1801969 + ... + 1812294.

It is an arithmetic number, because the mean of its divisors is an integer number (3111881304).

Almost surely, 2^18660439869 is an apocalyptic number.

It is an amenable number.

18660439869 is a deficient number, since it is larger than the sum of its proper divisors (6234610563).

18660439869 is a wasteful number, since it uses less digits than its factorization.

18660439869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615987.

The product of its (nonzero) digits is 13436928, while the sum is 60.

The spelling of 18660439869 in words is "eighteen billion, six hundred sixty million, four hundred thirty-nine thousand, eight hundred sixty-nine".