165669871 has 2 divisors, whose sum is σ = 165669872. Its totient is φ = 165669870.

The previous prime is 165669869. The next prime is 165669883. The reversal of 165669871 is 178966561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165669871 - 2¹ = 165669869 is a prime.

Together with 165669869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165669571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82834935 + 82834936.

It is an arithmetic number, because the mean of its divisors is an integer number (82834936).

Almost surely, 2^165669871 is an apocalyptic number.

165669871 is a deficient number, since it is larger than the sum of its proper divisors (1).

165669871 is an equidigital number, since it uses as much as digits as its factorization.

165669871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 165669871 is about 12871.2808608934. The cubic root of 165669871 is about 549.2218980614.

The spelling of 165669871 in words is "one hundred sixty-five million, six hundred sixty-nine thousand, eight hundred seventy-one".