18500351668685 has 32 divisors (see below), whose sum is σ = 22620432556800. Its totient is φ = 14521515240960.

The previous prime is 18500351668663. The next prime is 18500351668693. The reversal of 18500351668685 is 58686615300581.

It is a happy number.

It is not a de Polignac number, because 18500351668685 - 2²⁰ = 18500350620109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260060201 + ... + 260131329.

It is an arithmetic number, because the mean of its divisors is an integer number (706888517400).

Almost surely, 2^{18500351668685} is an apocalyptic number.

It is an amenable number.

18500351668685 is a deficient number, since it is larger than the sum of its proper divisors (4120080888115).

18500351668685 is a wasteful number, since it uses less digits than its factorization.

18500351668685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73301.

The product of its (nonzero) digits is 41472000, while the sum is 62.

The spelling of 18500351668685 in words is "eighteen trillion, five hundred billion, three hundred fifty-one million, six hundred sixty-eight thousand, six hundred eighty-five".