18023345391 has 8 divisors (see below), whose sum is σ = 24680617264. Its totient is φ = 11690818560.

The previous prime is 18023345377. The next prime is 18023345423. The reversal of 18023345391 is 19354332081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18023345391 - 2²³ = 18014956783 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 (18023345191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81186130 + ... + 81186351.

It is an arithmetic number, because the mean of its divisors is an integer number (3085077158).

Almost surely, 2^18023345391 is an apocalyptic number.

18023345391 is a deficient number, since it is larger than the sum of its proper divisors (6657271873).

18023345391 is a wasteful number, since it uses less digits than its factorization.

18023345391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162372521.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 18023345391 in words is "eighteen billion, twenty-three million, three hundred forty-five thousand, three hundred ninety-one".