165111623 has 4 divisors (see below), whose sum is σ = 165427848. Its totient is φ = 164795400.

The previous prime is 165111613. The next prime is 165111629. The reversal of 165111623 is 326111561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326111561 = 17 ⋅19183033.

It is a cyclic number.

It is not a de Polignac number, because 165111623 - 2⁸ = 165111367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165111592 and 165111601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165111629) 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, 157328 + ... + 158373.

It is an arithmetic number, because the mean of its divisors is an integer number (41356962).

Almost surely, 2^165111623 is an apocalyptic number.

165111623 is a deficient number, since it is larger than the sum of its proper divisors (316225).

165111623 is an equidigital number, since it uses as much as digits as its factorization.

165111623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316224.

The product of its digits is 1080, while the sum is 26.

The square root of 165111623 is about 12849.5767634580. The cubic root of 165111623 is about 548.6043103049.

The spelling of 165111623 in words is "one hundred sixty-five million, one hundred eleven thousand, six hundred twenty-three".