165210065 has 8 divisors (see below), whose sum is σ = 198335400. Its totient is φ = 132112512.

The previous prime is 165210061. The next prime is 165210091. The reversal of 165210065 is 560012561.

It can be written as a sum of positive squares in 4 ways, for example, as 524176 + 164685889 = 724^2 + 12833^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 165210065 - 2² = 165210061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165210061) 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, 9827 + ... + 20663.

It is an arithmetic number, because the mean of its divisors is an integer number (24791925).

Almost surely, 2^165210065 is an apocalyptic number.

It is an amenable number.

165210065 is a deficient number, since it is larger than the sum of its proper divisors (33125335).

165210065 is a wasteful number, since it uses less digits than its factorization.

165210065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13891.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 165210065 is about 12853.4067468512. The cubic root of 165210065 is about 548.7133173210.

The spelling of 165210065 in words is "one hundred sixty-five million, two hundred ten thousand, sixty-five".