671657757517 has 2 divisors, whose sum is σ = 671657757518. Its totient is φ = 671657757516.

The previous prime is 671657757509. The next prime is 671657757521. The reversal of 671657757517 is 715757756176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584263025641 + 87394731876 = 764371^2 + 295626^2 .

It is a cyclic number.

It is not a de Polignac number, because 671657757517 - 2³ = 671657757509 is a prime.

It is a super-2 number, since 2×671657757517² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671657757317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335828878758 + 335828878759.

It is an arithmetic number, because the mean of its divisors is an integer number (335828878759).

Almost surely, 2^671657757517 is an apocalyptic number.

It is an amenable number.

671657757517 is a deficient number, since it is larger than the sum of its proper divisors (1).

671657757517 is an equidigital number, since it uses as much as digits as its factorization.

671657757517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75631500, while the sum is 64.

The spelling of 671657757517 in words is "six hundred seventy-one billion, six hundred fifty-seven million, seven hundred fifty-seven thousand, five hundred seventeen".