165118571 has 2 divisors, whose sum is σ = 165118572. Its totient is φ = 165118570.

The previous prime is 165118559. The next prime is 165118573. The reversal of 165118571 is 175811561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165118571 - 2¹⁸ = 164856427 is a prime.

Together with 165118573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165118573) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82559285 + 82559286.

It is an arithmetic number, because the mean of its divisors is an integer number (82559286).

Almost surely, 2^165118571 is an apocalyptic number.

165118571 is a deficient number, since it is larger than the sum of its proper divisors (1).

165118571 is an equidigital number, since it uses as much as digits as its factorization.

165118571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 35.

The square root of 165118571 is about 12849.8471197131. The cubic root of 165118571 is about 548.6120054007.

The spelling of 165118571 in words is "one hundred sixty-five million, one hundred eighteen thousand, five hundred seventy-one".