165210565 has 8 divisors (see below), whose sum is σ = 213502968. Its totient is φ = 122001600.

The previous prime is 165210523. The next prime is 165210569. The reversal of 165210565 is 565012561.

It can be written as a sum of positive squares in 4 ways, for example, as 5466244 + 159744321 = 2338^2 + 12639^2 .

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

It is not a de Polignac number, because 165210565 - 2⁹ = 165210053 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165210569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1270786 + ... + 1270915.

It is an arithmetic number, because the mean of its divisors is an integer number (26687871).

Almost surely, 2^165210565 is an apocalyptic number.

It is an amenable number.

165210565 is a deficient number, since it is larger than the sum of its proper divisors (48292403).

165210565 is a wasteful number, since it uses less digits than its factorization.

165210565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541719.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 165210565 is about 12853.4261969329. The cubic root of 165210565 is about 548.7138708716.

The spelling of 165210565 in words is "one hundred sixty-five million, two hundred ten thousand, five hundred sixty-five".