18489446593 has 4 divisors (see below), whose sum is σ = 18542425300. Its totient is φ = 18436467888.

The previous prime is 18489446587. The next prime is 18489446603. The reversal of 18489446593 is 39564498481.

It is a happy number.

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 15328420864 + 3161025729 = 123808^2 + 56223^2 .

It is a cyclic number.

It is not a de Polignac number, because 18489446593 - 2⁵ = 18489446561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18489446543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26488830 + ... + 26489527.

It is an arithmetic number, because the mean of its divisors is an integer number (4635606325).

Almost surely, 2^18489446593 is an apocalyptic number.

It is an amenable number.

18489446593 is a deficient number, since it is larger than the sum of its proper divisors (52978707).

18489446593 is an equidigital number, since it uses as much as digits as its factorization.

18489446593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52978706.

The product of its digits is 29859840, while the sum is 61.

The spelling of 18489446593 in words is "eighteen billion, four hundred eighty-nine million, four hundred forty-six thousand, five hundred ninety-three".