18352018687 has 4 divisors (see below), whose sum is σ = 19431549216. Its totient is φ = 17272488160.

The previous prime is 18352018649. The next prime is 18352018691. The reversal of 18352018687 is 78681025381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18352018687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18352018687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18352015687) 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, 539765239 + ... + 539765272.

It is an arithmetic number, because the mean of its divisors is an integer number (4857887304).

Almost surely, 2^18352018687 is an apocalyptic number.

18352018687 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18352018687 is a deficient number, since it is larger than the sum of its proper divisors (1079530529).

18352018687 is a wasteful number, since it uses less digits than its factorization.

18352018687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079530528.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 18352018687 in words is "eighteen billion, three hundred fifty-two million, eighteen thousand, six hundred eighty-seven".