18642027871 has 4 divisors (see below), whose sum is σ = 18692006872. Its totient is φ = 18592048872.

The previous prime is 18642027839. The next prime is 18642027889. The reversal of 18642027871 is 17872024681.

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

It is a cyclic number.

It is not a de Polignac number, because 18642027871 - 2⁵ = 18642027839 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 (18642057871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24988941 + ... + 24989686.

It is an arithmetic number, because the mean of its divisors is an integer number (4673001718).

Almost surely, 2^18642027871 is an apocalyptic number.

18642027871 is a deficient number, since it is larger than the sum of its proper divisors (49979001).

18642027871 is an equidigital number, since it uses as much as digits as its factorization.

18642027871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49979000.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 18642027871 in words is "eighteen billion, six hundred forty-two million, twenty-seven thousand, eight hundred seventy-one".