165045565 has 8 divisors (see below), whose sum is σ = 201301848. Its totient is φ = 129871680.

The previous prime is 165045557. The next prime is 165045577. The reversal of 165045565 is 565540561.

It can be written as a sum of positive squares in 4 ways, for example, as 17131321 + 147914244 = 4139^2 + 12162^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165045565 - 2³ = 165045557 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 7 ways as a sum of consecutive naturals, for example, 270262 + ... + 270871.

It is an arithmetic number, because the mean of its divisors is an integer number (25162731).

Almost surely, 2^165045565 is an apocalyptic number.

It is an amenable number.

165045565 is a deficient number, since it is larger than the sum of its proper divisors (36256283).

165045565 is an equidigital number, since it uses as much as digits as its factorization.

165045565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541199.

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 165045565 is about 12847.0060714549. The cubic root of 165045565 is about 548.5311385179.

The spelling of 165045565 in words is "one hundred sixty-five million, forty-five thousand, five hundred sixty-five".