165666688 has 64 divisors (see below), whose sum is σ = 364054320. Its totient is φ = 74465280.

The previous prime is 165666673. The next prime is 165666707. The reversal of 165666688 is 886666561.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 135970 + ... + 137182.

Almost surely, 2^165666688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165666688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182027160).

165666688 is an abundant number, since it is smaller than the sum of its proper divisors (198387632).

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

165666688 is a wasteful number, since it uses less digits than its factorization.

165666688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1323 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 52.

The square root of 165666688 is about 12871.1572129316. The cubic root of 165666688 is about 549.2183806556.

The spelling of 165666688 in words is "one hundred sixty-five million, six hundred sixty-six thousand, six hundred eighty-eight".