18387023657 has 8 divisors (see below), whose sum is σ = 18471136320. Its totient is φ = 18303100720.

The previous prime is 18387023647. The next prime is 18387023717. The reversal of 18387023657 is 75632078381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18387023657 - 2¹² = 18387019561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18387023647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148682 + ... + 242652.

It is an arithmetic number, because the mean of its divisors is an integer number (2308892040).

Almost surely, 2^18387023657 is an apocalyptic number.

It is an amenable number.

18387023657 is a deficient number, since it is larger than the sum of its proper divisors (84112663).

18387023657 is an equidigital number, since it uses as much as digits as its factorization.

18387023657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94863.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 18387023657 in words is "eighteen billion, three hundred eighty-seven million, twenty-three thousand, six hundred fifty-seven".