165666066 has 8 divisors (see below), whose sum is σ = 331332144. Its totient is φ = 55222020.

The previous prime is 165666047. The next prime is 165666089. The reversal of 165666066 is 660666561.

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

165666066 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13805500 + ... + 13805511.

It is an arithmetic number, because the mean of its divisors is an integer number (41416518).

Almost surely, 2^165666066 is an apocalyptic number.

165666066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

165666066 is a wasteful number, since it uses less digits than its factorization.

165666066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27611016.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 165666066 is about 12871.1330503573. The cubic root of 165666066 is about 549.2176933031.

The spelling of 165666066 in words is "one hundred sixty-five million, six hundred sixty-six thousand, sixty-six".