18867517859 has 4 divisors (see below), whose sum is σ = 19223508816. Its totient is φ = 18511526904.

The previous prime is 18867517853. The next prime is 18867517871. The reversal of 18867517859 is 95871576881.

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-18867517859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18867517795 and 18867517804.

It is not an unprimeable number, because it can be changed into a prime (18867517853) 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, 177995399 + ... + 177995504.

It is an arithmetic number, because the mean of its divisors is an integer number (4805877204).

Almost surely, 2^18867517859 is an apocalyptic number.

18867517859 is a deficient number, since it is larger than the sum of its proper divisors (355990957).

18867517859 is an equidigital number, since it uses as much as digits as its factorization.

18867517859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355990956.

The product of its digits is 33868800, while the sum is 65.

The spelling of 18867517859 in words is "eighteen billion, eight hundred sixty-seven million, five hundred seventeen thousand, eight hundred fifty-nine".