18665868927 has 4 divisors (see below), whose sum is σ = 24887825240. Its totient is φ = 12443912616.

The previous prime is 18665868917. The next prime is 18665868931. The reversal of 18665868927 is 72986856681.

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

It is not a de Polignac number, because 18665868927 - 2⁸ = 18665868671 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 (18665868917) 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, 3110978152 + ... + 3110978157.

It is an arithmetic number, because the mean of its divisors is an integer number (6221956310).

Almost surely, 2^18665868927 is an apocalyptic number.

18665868927 is a deficient number, since it is larger than the sum of its proper divisors (6221956313).

18665868927 is an equidigital number, since it uses as much as digits as its factorization.

18665868927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221956312.

The product of its digits is 69672960, while the sum is 66.

The spelling of 18665868927 in words is "eighteen billion, six hundred sixty-five million, eight hundred sixty-eight thousand, nine hundred twenty-seven".