23638418917 has 4 divisors (see below), whose sum is σ = 23660657440. Its totient is φ = 23616180396.

The previous prime is 23638418911. The next prime is 23638418929. The reversal of 23638418917 is 71981483632.

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 23638418917 - 2²³ = 23630030309 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 (23638418911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11117667 + ... + 11119792.

It is an arithmetic number, because the mean of its divisors is an integer number (5915164360).

Almost surely, 2^23638418917 is an apocalyptic number.

It is an amenable number.

23638418917 is a deficient number, since it is larger than the sum of its proper divisors (22238523).

23638418917 is a wasteful number, since it uses less digits than its factorization.

23638418917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238522.

The product of its digits is 1741824, while the sum is 52.

The spelling of 23638418917 in words is "twenty-three billion, six hundred thirty-eight million, four hundred eighteen thousand, nine hundred seventeen".