664145224 has 16 divisors (see below), whose sum is σ = 1275645420. Its totient is φ = 323973120.

The previous prime is 664145219. The next prime is 664145281. The reversal of 664145224 is 422541466.

It can be written as a sum of positive squares in 2 ways, for example, as 515744100 + 148401124 = 22710^2 + 12182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664145224.

It is an unprimeable number.

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, 1012089 + ... + 1012744.

Almost surely, 2^664145224 is an apocalyptic number.

It is an amenable number.

664145224 is a deficient number, since it is larger than the sum of its proper divisors (611500196).

664145224 is a wasteful number, since it uses less digits than its factorization.

664145224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024880 (or 2024876 counting only the distinct ones).

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

The square root of 664145224 is about 25771.0151914898. The cubic root of 664145224 is about 872.4777317984.

The spelling of 664145224 in words is "six hundred sixty-four million, one hundred forty-five thousand, two hundred twenty-four".