165223565 has 16 divisors (see below), whose sum is σ = 218066688. Its totient is φ = 119413056.

The previous prime is 165223549. The next prime is 165223573. The reversal of 165223565 is 565322561.

165223565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165223565 - 2⁴ = 165223549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23987 + ... + 30096.

It is an arithmetic number, because the mean of its divisors is an integer number (13629168).

Almost surely, 2^165223565 is an apocalyptic number.

It is an amenable number.

165223565 is a deficient number, since it is larger than the sum of its proper divisors (52843123).

165223565 is a wasteful number, since it uses less digits than its factorization.

165223565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54148.

The product of its digits is 54000, while the sum is 35.

The square root of 165223565 is about 12853.9318887257. The cubic root of 165223565 is about 548.7282627947.

The spelling of 165223565 in words is "one hundred sixty-five million, two hundred twenty-three thousand, five hundred sixty-five".