18244327639 has 4 divisors (see below), whose sum is σ = 18246482280. Its totient is φ = 18242173000.

The previous prime is 18244327603. The next prime is 18244327643. The reversal of 18244327639 is 93672344281.

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

It is a cyclic number.

It is not a de Polignac number, because 18244327639 - 2¹³ = 18244319447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18244327592 and 18244327601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18244327039) 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, 1064569 + ... + 1081570.

It is an arithmetic number, because the mean of its divisors is an integer number (4561620570).

Almost surely, 2^18244327639 is an apocalyptic number.

18244327639 is a deficient number, since it is larger than the sum of its proper divisors (2154641).

18244327639 is an equidigital number, since it uses as much as digits as its factorization.

18244327639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154640.

The product of its digits is 1741824, while the sum is 49.

The spelling of 18244327639 in words is "eighteen billion, two hundred forty-four million, three hundred twenty-seven thousand, six hundred thirty-nine".