664512424 has 8 divisors (see below), whose sum is σ = 1245960810. Its totient is φ = 332256208.

The previous prime is 664512413. The next prime is 664512427. The reversal of 664512424 is 424215466.

It can be written as a sum of positive squares in only one way, i.e., 618516900 + 45995524 = 24870^2 + 6782^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 664512424.

It is not an unprimeable number, because it can be changed into a prime (664512427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41532019 + ... + 41532034.

Almost surely, 2^664512424 is an apocalyptic number.

It is an amenable number.

664512424 is a deficient number, since it is larger than the sum of its proper divisors (581448386).

664512424 is a wasteful number, since it uses less digits than its factorization.

664512424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83064059 (or 83064055 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 664512424 is about 25778.1384898134. The cubic root of 664512424 is about 872.6384972383.

The spelling of 664512424 in words is "six hundred sixty-four million, five hundred twelve thousand, four hundred twenty-four".