18336686867 has 4 divisors (see below), whose sum is σ = 18338646360. Its totient is φ = 18334727376.

The previous prime is 18336686833. The next prime is 18336686869. The reversal of 18336686867 is 76868663381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76868663381 = 9767 ⋅7870243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18336686867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18336686869) 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, 965642 + ... + 984447.

It is an arithmetic number, because the mean of its divisors is an integer number (4584661590).

Almost surely, 2^18336686867 is an apocalyptic number.

18336686867 is a deficient number, since it is larger than the sum of its proper divisors (1959493).

18336686867 is an equidigital number, since it uses as much as digits as its factorization.

18336686867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959492.

The product of its digits is 41803776, while the sum is 62.

The spelling of 18336686867 in words is "eighteen billion, three hundred thirty-six million, six hundred eighty-six thousand, eight hundred sixty-seven".