18235211659 has 16 divisors (see below), whose sum is σ = 21065907456. Its totient is φ = 15461690400.

The previous prime is 18235211651. The next prime is 18235211711. The reversal of 18235211659 is 95611253281.

It is a cyclic number.

It is not a de Polignac number, because 18235211659 - 2³ = 18235211651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18235211651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259324 + ... + 322054.

It is an arithmetic number, because the mean of its divisors is an integer number (1316619216).

Almost surely, 2^18235211659 is an apocalyptic number.

18235211659 is a deficient number, since it is larger than the sum of its proper divisors (2830695797).

18235211659 is a wasteful number, since it uses less digits than its factorization.

18235211659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63186.

The product of its digits is 129600, while the sum is 43.

The spelling of 18235211659 in words is "eighteen billion, two hundred thirty-five million, two hundred eleven thousand, six hundred fifty-nine".