18872268685 has 4 divisors (see below), whose sum is σ = 22646722428. Its totient is φ = 15097814944.

The previous prime is 18872268677. The next prime is 18872268703. The reversal of 18872268685 is 58686227881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7366273929 + 11505994756 = 85827^2 + 107266^2 .

It is a cyclic number.

It is not a de Polignac number, because 18872268685 - 2³ = 18872268677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887226864 + ... + 1887226873.

It is an arithmetic number, because the mean of its divisors is an integer number (5661680607).

Almost surely, 2^18872268685 is an apocalyptic number.

It is an amenable number.

18872268685 is a deficient number, since it is larger than the sum of its proper divisors (3774453743).

18872268685 is an equidigital number, since it uses as much as digits as its factorization.

18872268685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3774453742.

The product of its digits is 20643840, while the sum is 61.

The spelling of 18872268685 in words is "eighteen billion, eight hundred seventy-two million, two hundred sixty-eight thousand, six hundred eighty-five".