18703316609 has 4 divisors (see below), whose sum is σ = 18896134404. Its totient is φ = 18510498816.

The previous prime is 18703316587. The next prime is 18703316623. The reversal of 18703316609 is 90661330781.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13768675600 + 4934641009 = 117340^2 + 70247^2 .

It is a cyclic number.

It is not a de Polignac number, because 18703316609 - 2⁸ = 18703316353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18703316609.

It is not an unprimeable number, because it can be changed into a prime (18703316669) 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, 96408752 + ... + 96408945.

It is an arithmetic number, because the mean of its divisors is an integer number (4724033601).

Almost surely, 2^18703316609 is an apocalyptic number.

It is an amenable number.

18703316609 is a deficient number, since it is larger than the sum of its proper divisors (192817795).

18703316609 is an equidigital number, since it uses as much as digits as its factorization.

18703316609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192817794.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 18703316609 in words is "eighteen billion, seven hundred three million, three hundred sixteen thousand, six hundred nine".