165210066 has 48 divisors (see below), whose sum is σ = 417456000. Its totient is φ = 47201112.

The previous prime is 165210061. The next prime is 165210091. The reversal of 165210066 is 660012561.

It is a happy number.

165210066 is a `hidden beast` number, since 1 + 652 + 1 + 0 + 0 + 6 + 6 = 666.

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 23 ways as a sum of consecutive naturals, for example, 7206 + ... + 19553.

It is an arithmetic number, because the mean of its divisors is an integer number (8697000).

Almost surely, 2^165210066 is an apocalyptic number.

165210066 is an abundant number, since it is smaller than the sum of its proper divisors (252245934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165210066 is a wasteful number, since it uses less digits than its factorization.

165210066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788 (or 26771 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 165210066 is about 12853.4067857514. The cubic root of 165210066 is about 548.7133184281.

The spelling of 165210066 in words is "one hundred sixty-five million, two hundred ten thousand, sixty-six".