165765565 has 16 divisors (see below), whose sum is σ = 229426560. Its totient is φ = 112622400.

The previous prime is 165765539. The next prime is 165765631. The reversal of 165765565 is 565567561.

It is not a de Polignac number, because 165765565 - 2⁹ = 165765053 is a prime.

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, 17911 + ... + 25540.

It is an arithmetic number, because the mean of its divisors is an integer number (14339160).

Almost surely, 2^165765565 is an apocalyptic number.

It is an amenable number.

165765565 is a deficient number, since it is larger than the sum of its proper divisors (63660995).

165765565 is a wasteful number, since it uses less digits than its factorization.

165765565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43572.

The product of its digits is 945000, while the sum is 46.

The square root of 165765565 is about 12874.9976699027. The cubic root of 165765565 is about 549.3276246366.

The spelling of 165765565 in words is "one hundred sixty-five million, seven hundred sixty-five thousand, five hundred sixty-five".