660757 has 2 divisors, whose sum is σ = 660758. Its totient is φ = 660756.

The previous prime is 660733. The next prime is 660769. The reversal of 660757 is 757066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 155236 = 711^2 + 394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330378 + 330379.

It is an arithmetic number, because the mean of its divisors is an integer number (330379).

2⁶⁶⁰⁷⁵⁷ is an apocalyptic number.

It is an amenable number.

660757 is a deficient number, since it is larger than the sum of its proper divisors (1).

660757 is an equidigital number, since it uses as much as digits as its factorization.

660757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 660757 is about 812.8696082398. The cubic root of 660757 is about 87.0991515008.

The spelling of 660757 in words is "six hundred sixty thousand, seven hundred fifty-seven".