664757 has 2 divisors, whose sum is σ = 664758. Its totient is φ = 664756.

The previous prime is 664739. The next prime is 664771. The reversal of 664757 is 757466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556516 + 108241 = 746^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 664757 - 2⁶ = 664693 is a prime.

It is a Chen prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332378 + 332379.

It is an arithmetic number, because the mean of its divisors is an integer number (332379).

2⁶⁶⁴⁷⁵⁷ is an apocalyptic number.

It is an amenable number.

664757 is a deficient number, since it is larger than the sum of its proper divisors (1).

664757 is an equidigital number, since it uses as much as digits as its factorization.

664757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 35.

The square root of 664757 is about 815.3263150420. The cubic root of 664757 is about 87.2745543270.

The spelling of 664757 in words is "six hundred sixty-four thousand, seven hundred fifty-seven".