18418791344423 has 4 divisors (see below), whose sum is σ = 18421320363288. Its totient is φ = 18416262325560.

The previous prime is 18418791344411. The next prime is 18418791344449. The reversal of 18418791344423 is 32444319781481.

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 18418791344423 - 2⁸ = 18418791344167 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 (18418791344453) 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, 1264498508 + ... + 1264513073.

It is an arithmetic number, because the mean of its divisors is an integer number (4605330090822).

Almost surely, 2^{18418791344423} is an apocalyptic number.

18418791344423 is a deficient number, since it is larger than the sum of its proper divisors (2529018865).

18418791344423 is an equidigital number, since it uses as much as digits as its factorization.

18418791344423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529018864.

The product of its digits is 18579456, while the sum is 59.

The spelling of 18418791344423 in words is "eighteen trillion, four hundred eighteen billion, seven hundred ninety-one million, three hundred forty-four thousand, four hundred twenty-three".