23188638237 has 4 divisors (see below), whose sum is σ = 30918184320. Its totient is φ = 15459092156.

The previous prime is 23188638229. The next prime is 23188638247. The reversal of 23188638237 is 73283688132.

It is a happy number.

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 23188638237 - 2³ = 23188638229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23188638237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23188638227) 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, 3864773037 + ... + 3864773042.

It is an arithmetic number, because the mean of its divisors is an integer number (7729546080).

Almost surely, 2^23188638237 is an apocalyptic number.

It is an amenable number.

23188638237 is a deficient number, since it is larger than the sum of its proper divisors (7729546083).

23188638237 is an equidigital number, since it uses as much as digits as its factorization.

23188638237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729546082.

The product of its digits is 2322432, while the sum is 51.

The spelling of 23188638237 in words is "twenty-three billion, one hundred eighty-eight million, six hundred thirty-eight thousand, two hundred thirty-seven".