165842965 has 4 divisors (see below), whose sum is σ = 199011564. Its totient is φ = 132674368.

The previous prime is 165842951. The next prime is 165842969. The reversal of 165842965 is 569248561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569248561 = 7 ⋅81321223.

It can be written as a sum of positive squares in 2 ways, for example, as 59814756 + 106028209 = 7734^2 + 10297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165842965 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 (165842969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16584292 + ... + 16584301.

It is an arithmetic number, because the mean of its divisors is an integer number (49752891).

Almost surely, 2^165842965 is an apocalyptic number.

It is an amenable number.

165842965 is a deficient number, since it is larger than the sum of its proper divisors (33168599).

165842965 is an equidigital number, since it uses as much as digits as its factorization.

165842965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33168598.

The product of its digits is 518400, while the sum is 46.

The square root of 165842965 is about 12878.0031448979. The cubic root of 165842965 is about 549.4131095046.

The spelling of 165842965 in words is "one hundred sixty-five million, eight hundred forty-two thousand, nine hundred sixty-five".