665717472757 has 2 divisors, whose sum is σ = 665717472758. Its totient is φ = 665717472756.

The previous prime is 665717472733. The next prime is 665717472811. The reversal of 665717472757 is 757274717566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 581964533956 + 83752938801 = 762866^2 + 289401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665717472757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665717472157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332858736378 + 332858736379.

It is an arithmetic number, because the mean of its divisors is an integer number (332858736379).

Almost surely, 2^665717472757 is an apocalyptic number.

It is an amenable number.

665717472757 is a deficient number, since it is larger than the sum of its proper divisors (1).

665717472757 is an equidigital number, since it uses as much as digits as its factorization.

665717472757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121010400, while the sum is 64.

The spelling of 665717472757 in words is "six hundred sixty-five billion, seven hundred seventeen million, four hundred seventy-two thousand, seven hundred fifty-seven".