18502085687 has 4 divisors (see below), whose sum is σ = 18546034056. Its totient is φ = 18458137320.

The previous prime is 18502085683. The next prime is 18502085729. The reversal of 18502085687 is 78658020581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78658020581 = 7 ⋅11236860083.

It is a cyclic number.

It is not a de Polignac number, because 18502085687 - 2² = 18502085683 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 (18502085681) 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, 21973553 + ... + 21974394.

It is an arithmetic number, because the mean of its divisors is an integer number (4636508514).

Almost surely, 2^18502085687 is an apocalyptic number.

18502085687 is a deficient number, since it is larger than the sum of its proper divisors (43948369).

18502085687 is an equidigital number, since it uses as much as digits as its factorization.

18502085687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43948368.

The product of its (nonzero) digits is 1075200, while the sum is 50.

The spelling of 18502085687 in words is "eighteen billion, five hundred two million, eighty-five thousand, six hundred eighty-seven".