18684705623 has 4 divisors (see below), whose sum is σ = 18685303008. Its totient is φ = 18684108240.

The previous prime is 18684705617. The next prime is 18684705631. The reversal of 18684705623 is 32650748681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32650748681 = 3877 ⋅8421653.

It is a cyclic number.

It is not a de Polignac number, because 18684705623 - 2²⁸ = 18416270167 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 (18684705323) 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, 249023 + ... + 315248.

It is an arithmetic number, because the mean of its divisors is an integer number (4671325752).

Almost surely, 2^18684705623 is an apocalyptic number.

18684705623 is a deficient number, since it is larger than the sum of its proper divisors (597385).

18684705623 is an equidigital number, since it uses as much as digits as its factorization.

18684705623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597384.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 18684705623 in words is "eighteen billion, six hundred eighty-four million, seven hundred five thousand, six hundred twenty-three".