671571516257 has 2 divisors, whose sum is σ = 671571516258. Its totient is φ = 671571516256.

The previous prime is 671571516227. The next prime is 671571516313. The reversal of 671571516257 is 752615175176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411399091216 + 260172425041 = 641404^2 + 510071^2 .

It is a cyclic number.

It is not a de Polignac number, because 671571516257 - 2⁸ = 671571516001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671571516199 and 671571516208.

It is not a weakly prime, because it can be changed into another prime (671571516227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335785758128 + 335785758129.

It is an arithmetic number, because the mean of its divisors is an integer number (335785758129).

Almost surely, 2^671571516257 is an apocalyptic number.

It is an amenable number.

671571516257 is a deficient number, since it is larger than the sum of its proper divisors (1).

671571516257 is an equidigital number, since it uses as much as digits as its factorization.

671571516257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3087000, while the sum is 53.

The spelling of 671571516257 in words is "six hundred seventy-one billion, five hundred seventy-one million, five hundred sixteen thousand, two hundred fifty-seven".