18028723871 has 2 divisors, whose sum is σ = 18028723872. Its totient is φ = 18028723870.

The previous prime is 18028723807. The next prime is 18028723883. The reversal of 18028723871 is 17832782081.

It is a strong prime.

It is an emirp because it is prime and its reverse (17832782081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18028723871 - 2⁶ = 18028723807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18028773871) 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 as a sum of consecutive naturals, namely, 9014361935 + 9014361936.

It is an arithmetic number, because the mean of its divisors is an integer number (9014361936).

Almost surely, 2^18028723871 is an apocalyptic number.

18028723871 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028723871 is an equidigital number, since it uses as much as digits as its factorization.

18028723871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 18028723871 in words is "eighteen billion, twenty-eight million, seven hundred twenty-three thousand, eight hundred seventy-one".