664758116929 has 9 divisors (see below), whose sum is σ = 694936879203. Its totient is φ = 635837652912.

The previous prime is 664758116903. The next prime is 664758116933. The reversal of 664758116929 is 929611857466.

The square root of 664758116929 is 815327.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 233266782529 + 431491334400 = 482977^2 + 656880^2 .

It is not a de Polignac number, because 664758116929 - 2⁷ = 664758116801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664758116959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18734797 + ... + 18770245.

Almost surely, 2^664758116929 is an apocalyptic number.

664758116929 is the 815327-th square number.

664758116929 is the 407664-th centered octagonal number.

It is an amenable number.

664758116929 is a deficient number, since it is larger than the sum of its proper divisors (30178762274).

664758116929 is an frugal number, since it uses more digits than its factorization.

664758116929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70944 (or 35472 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 64.

Multiplying 664758116929 by its sum of digits (64), we get a square (42544519483456 = 6522616²).

The spelling of 664758116929 in words is "six hundred sixty-four billion, seven hundred fifty-eight million, one hundred sixteen thousand, nine hundred twenty-nine".