664544532 has 48 divisors (see below), whose sum is σ = 1670197760. Its totient is φ = 204972768.

The previous prime is 664544521. The next prime is 664544537. The reversal of 664544532 is 235445466.

It is a super-2 number, since 2×664544532² = 883238870022198048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664544537) 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 15 ways as a sum of consecutive naturals, for example, 24088 + ... + 43695.

Almost surely, 2^664544532 is an apocalyptic number.

It is an amenable number.

664544532 is an abundant number, since it is smaller than the sum of its proper divisors (1005653228).

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

664544532 is a wasteful number, since it uses less digits than its factorization.

664544532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67852 (or 67850 counting only the distinct ones).

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

The square root of 664544532 is about 25778.7612580589. The cubic root of 664544532 is about 872.6525517664.

Adding to 664544532 its reverse (235445466), we get a palindrome (899989998).

The spelling of 664544532 in words is "six hundred sixty-four million, five hundred forty-four thousand, five hundred thirty-two".