165944664 has 24 divisors (see below), whose sum is σ = 449433660. Its totient is φ = 55314864.

The previous prime is 165944663. The next prime is 165944687. The reversal of 165944664 is 466449561.

It is a happy number.

165944664 is a `hidden beast` number, since 16 + 594 + 46 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165944663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1152322 + ... + 1152465.

Almost surely, 2^165944664 is an apocalyptic number.

It is an amenable number.

165944664 is an abundant number, since it is smaller than the sum of its proper divisors (283488996).

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

165944664 is a wasteful number, since it uses less digits than its factorization.

165944664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304799 (or 2304792 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 165944664 is about 12881.9510944577. The cubic root of 165944664 is about 549.5253911168.

The spelling of 165944664 in words is "one hundred sixty-five million, nine hundred forty-four thousand, six hundred sixty-four".