18534591317 has 16 divisors (see below), whose sum is σ = 20541079104. Its totient is φ = 16583616000.

The previous prime is 18534591311. The next prime is 18534591319. The reversal of 18534591317 is 71319543581.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18534591317 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 (18534591311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145142 + ... + 241112.

It is an arithmetic number, because the mean of its divisors is an integer number (1283817444).

Almost surely, 2^18534591317 is an apocalyptic number.

It is an amenable number.

18534591317 is a deficient number, since it is larger than the sum of its proper divisors (2006487787).

18534591317 is a wasteful number, since it uses less digits than its factorization.

18534591317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96260.

The product of its digits is 453600, while the sum is 47.

The spelling of 18534591317 in words is "eighteen billion, five hundred thirty-four million, five hundred ninety-one thousand, three hundred seventeen".