18371920079 has 4 divisors (see below), whose sum is σ = 18390459840. Its totient is φ = 18353380320.

The previous prime is 18371920069. The next prime is 18371920103. The reversal of 18371920079 is 97002917381.

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 18371920079 - 2⁸ = 18371919823 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 (18371920069) 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, 9268394 + ... + 9270375.

It is an arithmetic number, because the mean of its divisors is an integer number (4597614960).

Almost surely, 2^18371920079 is an apocalyptic number.

18371920079 is a deficient number, since it is larger than the sum of its proper divisors (18539761).

18371920079 is an equidigital number, since it uses as much as digits as its factorization.

18371920079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18539760.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 18371920079 in words is "eighteen billion, three hundred seventy-one million, nine hundred twenty thousand, seventy-nine".