690660757 has 2 divisors, whose sum is σ = 690660758. Its totient is φ = 690660756.

The previous prime is 690660653. The next prime is 690660791. The reversal of 690660757 is 757066096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413471556 + 277189201 = 20334^2 + 16649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690660757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690660557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345330378 + 345330379.

It is an arithmetic number, because the mean of its divisors is an integer number (345330379).

Almost surely, 2^690660757 is an apocalyptic number.

It is an amenable number.

690660757 is a deficient number, since it is larger than the sum of its proper divisors (1).

690660757 is an equidigital number, since it uses as much as digits as its factorization.

690660757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 690660757 is about 26280.4253580493. The cubic root of 690660757 is about 883.9375706648.

The spelling of 690660757 in words is "six hundred ninety million, six hundred sixty thousand, seven hundred fifty-seven".