165570666 has 8 divisors (see below), whose sum is σ = 331141344. Its totient is φ = 55190220.

The previous prime is 165570637. The next prime is 165570709. The reversal of 165570666 is 666075561.

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

165570666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13797550 + ... + 13797561.

It is an arithmetic number, because the mean of its divisors is an integer number (41392668).

Almost surely, 2^165570666 is an apocalyptic number.

165570666 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.

165570666 is a wasteful number, since it uses less digits than its factorization.

165570666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27595116.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 165570666 is about 12867.4265492366. The cubic root of 165570666 is about 549.1122494025.

The spelling of 165570666 in words is "one hundred sixty-five million, five hundred seventy thousand, six hundred sixty-six".