664507610 has 32 divisors (see below), whose sum is σ = 1289327760. Its totient is φ = 245127168.

The previous prime is 664507609. The next prime is 664507621. The reversal of 664507610 is 16705466.

It can be written as a sum of positive squares in 8 ways, for example, as 315453121 + 349054489 = 17761^2 + 18683^2 .

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 208106 + ... + 211274.

Almost surely, 2^664507610 is an apocalyptic number.

664507610 is a deficient number, since it is larger than the sum of its proper divisors (624820150).

664507610 is a wasteful number, since it uses less digits than its factorization.

664507610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 664507610 is about 25778.0451159509. The cubic root of 664507610 is about 872.6363899831.

The spelling of 664507610 in words is "six hundred sixty-four million, five hundred seven thousand, six hundred ten".