18044242807 has 4 divisors (see below), whose sum is σ = 18044528040. Its totient is φ = 18043957576.

The previous prime is 18044242793. The next prime is 18044242817. The reversal of 18044242807 is 70824244081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18044242807 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 18044242807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18044242817) 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, 553 + ... + 189970.

It is an arithmetic number, because the mean of its divisors is an integer number (4511132010).

Almost surely, 2^18044242807 is an apocalyptic number.

18044242807 is a deficient number, since it is larger than the sum of its proper divisors (285233).

18044242807 is an equidigital number, since it uses as much as digits as its factorization.

18044242807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285232.

The product of its (nonzero) digits is 114688, while the sum is 40.

Adding to 18044242807 its reverse (70824244081), we get a palindrome (88868486888).

The spelling of 18044242807 in words is "eighteen billion, forty-four million, two hundred forty-two thousand, eight hundred seven".