18590504409 has 27 divisors (see below), whose sum is σ = 27464848437. Its totient is φ = 12117430584.

The previous prime is 18590504369. The next prime is 18590504431. The reversal of 18590504409 is 90440509581.

The square root of 18590504409 is 136347.

It is a perfect power (a square), and thus also a powerful number.

18590504409 is a `hidden beast` number, since 1 + 8 + 590 + 50 + 4 + 4 + 0 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-18590504409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18590504489) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19224444 + ... + 19225410.

Almost surely, 2^18590504409 is an apocalyptic number.

18590504409 is the 136347-th square number.

18590504409 is the 68174-th centered octagonal number.

It is an amenable number.

18590504409 is a deficient number, since it is larger than the sum of its proper divisors (8874344028).

18590504409 is an frugal number, since it uses more digits than its factorization.

18590504409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 18590504409 in words is "eighteen billion, five hundred ninety million, five hundred four thousand, four hundred nine".