18087768957 has 4 divisors (see below), whose sum is σ = 24117025280. Its totient is φ = 12058512636.

The previous prime is 18087768949. The next prime is 18087768973. The reversal of 18087768957 is 75986778081.

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 not a de Polignac number, because 18087768957 - 2³ = 18087768949 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 (18087768947) 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, 3014628157 + ... + 3014628162.

It is an arithmetic number, because the mean of its divisors is an integer number (6029256320).

Almost surely, 2^18087768957 is an apocalyptic number.

It is an amenable number.

18087768957 is a deficient number, since it is larger than the sum of its proper divisors (6029256323).

18087768957 is an equidigital number, since it uses as much as digits as its factorization.

18087768957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029256322.

The product of its (nonzero) digits is 47416320, while the sum is 66.

The spelling of 18087768957 in words is "eighteen billion, eighty-seven million, seven hundred sixty-eight thousand, nine hundred fifty-seven".