18028474613 has 4 divisors (see below), whose sum is σ = 18468193548. Its totient is φ = 17588755680.

The previous prime is 18028474609. The next prime is 18028474621. The reversal of 18028474613 is 31647482081.

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 6671949124 + 11356525489 = 81682^2 + 106567^2 .

It is a cyclic number.

It is not a de Polignac number, because 18028474613 - 2² = 18028474609 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 (18028474913) 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, 219859406 + ... + 219859487.

It is an arithmetic number, because the mean of its divisors is an integer number (4617048387).

Almost surely, 2^18028474613 is an apocalyptic number.

It is an amenable number.

18028474613 is a deficient number, since it is larger than the sum of its proper divisors (439718935).

18028474613 is an equidigital number, since it uses as much as digits as its factorization.

18028474613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439718934.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 18028474613 in words is "eighteen billion, twenty-eight million, four hundred seventy-four thousand, six hundred thirteen".