664348577 has 2 divisors, whose sum is σ = 664348578. Its totient is φ = 664348576.

The previous prime is 664348567. The next prime is 664348589. The reversal of 664348577 is 775843466.

664348577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447787921 + 216560656 = 21161^2 + 14716^2 .

It is a cyclic number.

It is not a de Polignac number, because 664348577 - 2⁴ = 664348561 is a prime.

It is not a weakly prime, because it can be changed into another prime (664348567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332174288 + 332174289.

It is an arithmetic number, because the mean of its divisors is an integer number (332174289).

Almost surely, 2^664348577 is an apocalyptic number.

It is an amenable number.

664348577 is a deficient number, since it is larger than the sum of its proper divisors (1).

664348577 is an equidigital number, since it uses as much as digits as its factorization.

664348577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 50.

The square root of 664348577 is about 25774.9602715504. The cubic root of 664348577 is about 872.5667699850.

The spelling of 664348577 in words is "six hundred sixty-four million, three hundred forty-eight thousand, five hundred seventy-seven".