18678566231 has 4 divisors (see below), whose sum is σ = 20115379032. Its totient is φ = 17241753432.

The previous prime is 18678566197. The next prime is 18678566233. The reversal of 18678566231 is 13266587681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18678566231 - 2¹⁴ = 18678549847 is a prime.

It is a super-2 number, since 2×18678566231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678566233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718406381 + ... + 718406406.

It is an arithmetic number, because the mean of its divisors is an integer number (5028844758).

Almost surely, 2^18678566231 is an apocalyptic number.

18678566231 is a deficient number, since it is larger than the sum of its proper divisors (1436812801).

18678566231 is a wasteful number, since it uses less digits than its factorization.

18678566231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436812800.

The product of its digits is 2903040, while the sum is 53.

The spelling of 18678566231 in words is "eighteen billion, six hundred seventy-eight million, five hundred sixty-six thousand, two hundred thirty-one".