165795665 has 12 divisors (see below), whose sum is σ = 231437556. Its totient is φ = 113688288.

The previous prime is 165795599. The next prime is 165795667. The reversal of 165795665 is 566597561.

It can be written as a sum of positive squares in 2 ways, for example, as 32069569 + 133726096 = 5663^2 + 11564^2 .

It is not a de Polignac number, because 165795665 - 2¹² = 165791569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165795667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338114 + ... + 338603.

It is an arithmetic number, because the mean of its divisors is an integer number (19286463).

Almost surely, 2^165795665 is an apocalyptic number.

It is an amenable number.

165795665 is a deficient number, since it is larger than the sum of its proper divisors (65641891).

165795665 is an equidigital number, since it uses as much as digits as its factorization.

165795665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676736 (or 676729 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 50.

The square root of 165795665 is about 12876.1665490937. The cubic root of 165795665 is about 549.3608719133.

The spelling of 165795665 in words is "one hundred sixty-five million, seven hundred ninety-five thousand, six hundred sixty-five".