331665671 has 2 divisors, whose sum is σ = 331665672. Its totient is φ = 331665670.

The previous prime is 331665661. The next prime is 331665703. The reversal of 331665671 is 176566133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331665671 - 2¹⁰ = 331664647 is a prime.

It is a super-2 number, since 2×331665671² = 220004234639760482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331665661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165832835 + 165832836.

It is an arithmetic number, because the mean of its divisors is an integer number (165832836).

Almost surely, 2^331665671 is an apocalyptic number.

331665671 is a deficient number, since it is larger than the sum of its proper divisors (1).

331665671 is an equidigital number, since it uses as much as digits as its factorization.

331665671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 331665671 is about 18211.6905036298. The cubic root of 331665671 is about 692.2030481870.

The spelling of 331665671 in words is "three hundred thirty-one million, six hundred sixty-five thousand, six hundred seventy-one".