18553816689 has 16 divisors (see below), whose sum is σ = 25215624000. Its totient is φ = 12130803776.

The previous prime is 18553816661. The next prime is 18553816693. The reversal of 18553816689 is 98661835581.

It is a cyclic number.

It is not a de Polignac number, because 18553816689 - 2⁵ = 18553816657 is a prime.

It is a super-2 number, since 2×18553816689² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18553816189) 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, 382402 + ... + 428180.

It is an arithmetic number, because the mean of its divisors is an integer number (1575976500).

Almost surely, 2^18553816689 is an apocalyptic number.

It is an amenable number.

18553816689 is a deficient number, since it is larger than the sum of its proper divisors (6661807311).

18553816689 is a wasteful number, since it uses less digits than its factorization.

18553816689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48384.

The product of its digits is 12441600, while the sum is 60.

The spelling of 18553816689 in words is "eighteen billion, five hundred fifty-three million, eight hundred sixteen thousand, six hundred eighty-nine".