18623205723 has 4 divisors (see below), whose sum is σ = 24830940968. Its totient is φ = 12415470480.

The previous prime is 18623205721. The next prime is 18623205749. The reversal of 18623205723 is 32750232681.

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

It is not a de Polignac number, because 18623205723 - 2¹ = 18623205721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18623205721) 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, 3103867618 + ... + 3103867623.

It is an arithmetic number, because the mean of its divisors is an integer number (6207735242).

Almost surely, 2^18623205723 is an apocalyptic number.

18623205723 is a deficient number, since it is larger than the sum of its proper divisors (6207735245).

18623205723 is an equidigital number, since it uses as much as digits as its factorization.

18623205723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6207735244.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 18623205723 in words is "eighteen billion, six hundred twenty-three million, two hundred five thousand, seven hundred twenty-three".