165711671 has 2 divisors, whose sum is σ = 165711672. Its totient is φ = 165711670.

The previous prime is 165711661. The next prime is 165711737. The reversal of 165711671 is 176117561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165711671 is a prime.

It is a super-2 number, since 2×165711671² = 54920715811224482, 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 (165711661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82855835 + 82855836.

It is an arithmetic number, because the mean of its divisors is an integer number (82855836).

Almost surely, 2^165711671 is an apocalyptic number.

165711671 is a deficient number, since it is larger than the sum of its proper divisors (1).

165711671 is an equidigital number, since it uses as much as digits as its factorization.

165711671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 35.

The square root of 165711671 is about 12872.9045285048. The cubic root of 165711671 is about 549.2680853870.

The spelling of 165711671 in words is "one hundred sixty-five million, seven hundred eleven thousand, six hundred seventy-one".