18718304573 has 4 divisors (see below), whose sum is σ = 18760943520. Its totient is φ = 18675665628.

The previous prime is 18718304513. The next prime is 18718304611. The reversal of 18718304573 is 37540381781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18718304573 - 2¹⁶ = 18718239037 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 (18718304513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21318815 + ... + 21319692.

It is an arithmetic number, because the mean of its divisors is an integer number (4690235880).

Almost surely, 2^18718304573 is an apocalyptic number.

It is an amenable number.

18718304573 is a deficient number, since it is larger than the sum of its proper divisors (42638947).

18718304573 is an equidigital number, since it uses as much as digits as its factorization.

18718304573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42638946.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 18718304573 in words is "eighteen billion, seven hundred eighteen million, three hundred four thousand, five hundred seventy-three".