664244433 has 24 divisors (see below), whose sum is σ = 980402280. Its totient is φ = 433244160.

The previous prime is 664244411. The next prime is 664244437. The reversal of 664244433 is 334442466.

664244433 is a `hidden beast` number, since 6 + 642 + 4 + 4 + 4 + 3 + 3 = 666.

664244433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12616704 + 651627729 = 3552^2 + 25527^2 .

It is not a de Polignac number, because 664244433 - 2⁵ = 664244401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664244437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102823 + ... + 109091.

It is an arithmetic number, because the mean of its divisors is an integer number (40850095).

Almost surely, 2^664244433 is an apocalyptic number.

It is an amenable number.

664244433 is a deficient number, since it is larger than the sum of its proper divisors (316157847).

664244433 is a wasteful number, since it uses less digits than its factorization.

664244433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6529 (or 6526 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

The square root of 664244433 is about 25772.9399370735. The cubic root of 664244433 is about 872.5211727661.

Adding to 664244433 its reverse (334442466), we get a palindrome (998686899).

The spelling of 664244433 in words is "six hundred sixty-four million, two hundred forty-four thousand, four hundred thirty-three".