18665493713 has 4 divisors (see below), whose sum is σ = 18666083940. Its totient is φ = 18664903488.

The previous prime is 18665493709. The next prime is 18665493719. The reversal of 18665493713 is 31739456681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31739456681 = 61469 ⋅516349.

It can be written as a sum of positive squares in 2 ways, for example, as 6610990864 + 12054502849 = 81308^2 + 109793^2 .

It is a cyclic number.

It is not a de Polignac number, because 18665493713 - 2² = 18665493709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18665493719) 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, 244820 + ... + 311877.

It is an arithmetic number, because the mean of its divisors is an integer number (4666520985).

Almost surely, 2^18665493713 is an apocalyptic number.

It is an amenable number.

18665493713 is a deficient number, since it is larger than the sum of its proper divisors (590227).

18665493713 is an equidigital number, since it uses as much as digits as its factorization.

18665493713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590226.

The product of its digits is 3265920, while the sum is 53.

The spelling of 18665493713 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety-three thousand, seven hundred thirteen".