18381234657 has 8 divisors (see below), whose sum is σ = 25798224160. Its totient is φ = 11609200800.

The previous prime is 18381234631. The next prime is 18381234673. The reversal of 18381234657 is 75643218381.

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

It is a de Polignac number, because none of the positive numbers 2^k-18381234657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18381234607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161238844 + ... + 161238957.

It is an arithmetic number, because the mean of its divisors is an integer number (3224778020).

Almost surely, 2^18381234657 is an apocalyptic number.

It is an amenable number.

18381234657 is a deficient number, since it is larger than the sum of its proper divisors (7416989503).

18381234657 is a wasteful number, since it uses less digits than its factorization.

18381234657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322477823.

The product of its digits is 967680, while the sum is 48.

The spelling of 18381234657 in words is "eighteen billion, three hundred eighty-one million, two hundred thirty-four thousand, six hundred fifty-seven".