18245616013 has 4 divisors (see below), whose sum is σ = 18246476380. Its totient is φ = 18244755648.

The previous prime is 18245615957. The next prime is 18245616041. The reversal of 18245616013 is 31061654281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31061654281 = 7 ⋅4437379183.

It can be written as a sum of positive squares in 2 ways, for example, as 13910315364 + 4335300649 = 117942^2 + 65843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18245616013 - 2⁹ = 18245615501 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 (18245616043) 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, 397548 + ... + 441061.

It is an arithmetic number, because the mean of its divisors is an integer number (4561619095).

Almost surely, 2^18245616013 is an apocalyptic number.

It is an amenable number.

18245616013 is a deficient number, since it is larger than the sum of its proper divisors (860367).

18245616013 is an equidigital number, since it uses as much as digits as its factorization.

18245616013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860366.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 18245616013 in words is "eighteen billion, two hundred forty-five million, six hundred sixteen thousand, thirteen".