165020671 has 4 divisors (see below), whose sum is σ = 165139200. Its totient is φ = 164902144.

The previous prime is 165020623. The next prime is 165020741. The reversal of 165020671 is 176020561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165020671 - 2²⁵ = 131466239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165020771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57151 + ... + 59968.

It is an arithmetic number, because the mean of its divisors is an integer number (41284800).

Almost surely, 2^165020671 is an apocalyptic number.

165020671 is a deficient number, since it is larger than the sum of its proper divisors (118529).

165020671 is a wasteful number, since it uses less digits than its factorization.

165020671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118528.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 165020671 is about 12846.0371710501. The cubic root of 165020671 is about 548.5035586174.

The spelling of 165020671 in words is "one hundred sixty-five million, twenty thousand, six hundred seventy-one".