664445532 has 12 divisors (see below), whose sum is σ = 1550372936. Its totient is φ = 221481840.

The previous prime is 664445513. The next prime is 664445543. The reversal of 664445532 is 235544466.

664445532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27685219 + ... + 27685242.

Almost surely, 2^664445532 is an apocalyptic number.

It is an amenable number.

664445532 is an abundant number, since it is smaller than the sum of its proper divisors (885927404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664445532 is a wasteful number, since it uses less digits than its factorization.

664445532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55370468 (or 55370466 counting only the distinct ones).

The product of its digits is 345600, while the sum is 39.

The square root of 664445532 is about 25776.8410011778. The cubic root of 664445532 is about 872.6092153714.

Adding to 664445532 its reverse (235544466), we get a palindrome (899989998).

The spelling of 664445532 in words is "six hundred sixty-four million, four hundred forty-five thousand, five hundred thirty-two".