18518368517 has 4 divisors (see below), whose sum is σ = 20201856576. Its totient is φ = 16834880460.

The previous prime is 18518368507. The next prime is 18518368523. The reversal of 18518368517 is 71586381581.

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 18518368517 - 2¹⁴ = 18518352133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518368507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841744013 + ... + 841744034.

It is an arithmetic number, because the mean of its divisors is an integer number (5050464144).

Almost surely, 2^18518368517 is an apocalyptic number.

It is an amenable number.

18518368517 is a deficient number, since it is larger than the sum of its proper divisors (1683488059).

18518368517 is a wasteful number, since it uses less digits than its factorization.

18518368517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683488058.

The product of its digits is 1612800, while the sum is 53.

The spelling of 18518368517 in words is "eighteen billion, five hundred eighteen million, three hundred sixty-eight thousand, five hundred seventeen".