18671318557 has 8 divisors (see below), whose sum is σ = 19533993984. Its totient is φ = 17812883088.

The previous prime is 18671318543. The next prime is 18671318579. The reversal of 18671318557 is 75581317681.

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 18671318557 - 2⁷ = 18671318429 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 (18671310557) 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, 1050978 + ... + 1068595.

It is an arithmetic number, because the mean of its divisors is an integer number (2441749248).

Almost surely, 2^18671318557 is an apocalyptic number.

It is an amenable number.

18671318557 is a deficient number, since it is larger than the sum of its proper divisors (862675427).

18671318557 is a wasteful number, since it uses less digits than its factorization.

18671318557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119979.

The product of its digits is 1411200, while the sum is 52.

The spelling of 18671318557 in words is "eighteen billion, six hundred seventy-one million, three hundred eighteen thousand, five hundred fifty-seven".