165172111 has 8 divisors (see below), whose sum is σ = 187239920. Its totient is φ = 144441792.

The previous prime is 165172099. The next prime is 165172121. The reversal of 165172111 is 111271561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165172111 - 2⁹ = 165171599 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 (165172121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334110 + ... + 334603.

It is an arithmetic number, because the mean of its divisors is an integer number (23404990).

Almost surely, 2^165172111 is an apocalyptic number.

165172111 is a deficient number, since it is larger than the sum of its proper divisors (22067809).

165172111 is a wasteful number, since it uses less digits than its factorization.

165172111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668745.

The product of its digits is 420, while the sum is 25.

The square root of 165172111 is about 12851.9302441306. The cubic root of 165172111 is about 548.6712951431.

The spelling of 165172111 in words is "one hundred sixty-five million, one hundred seventy-two thousand, one hundred eleven".