18516835018517 has 4 divisors (see below), whose sum is σ = 20200183656576. Its totient is φ = 16833486380460.

The previous prime is 18516835018459. The next prime is 18516835018531. The reversal of 18516835018517 is 71581053861581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18516835018517 - 2¹⁸ = 18516834756373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516835015517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841674319013 + ... + 841674319034.

It is an arithmetic number, because the mean of its divisors is an integer number (5050045914144).

Almost surely, 2^{18516835018517} is an apocalyptic number.

It is an amenable number.

18516835018517 is a deficient number, since it is larger than the sum of its proper divisors (1683348638059).

18516835018517 is a wasteful number, since it uses less digits than its factorization.

18516835018517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683348638058.

The product of its (nonzero) digits is 8064000, while the sum is 59.

The spelling of 18516835018517 in words is "eighteen trillion, five hundred sixteen billion, eight hundred thirty-five million, eighteen thousand, five hundred seventeen".