18689464431 has 24 divisors (see below), whose sum is σ = 29457389520. Its totient is φ = 11324131200.

The previous prime is 18689464429. The next prime is 18689464501. The reversal of 18689464431 is 13446498681.

18689464431 is a `hidden beast` number, since 1 + 8 + 68 + 94 + 64 + 431 = 666.

It is not a de Polignac number, because 18689464431 - 2¹ = 18689464429 is a prime.

It is a super-2 number, since 2×18689464431² (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 (18689464411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418405 + ... + 460913.

It is an arithmetic number, because the mean of its divisors is an integer number (1227391230).

Almost surely, 2^18689464431 is an apocalyptic number.

18689464431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18689464431 is a deficient number, since it is larger than the sum of its proper divisors (10767925089).

18689464431 is a wasteful number, since it uses less digits than its factorization.

18689464431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46967 (or 46964 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 18689464431 in words is "eighteen billion, six hundred eighty-nine million, four hundred sixty-four thousand, four hundred thirty-one".