165439985 has 8 divisors (see below), whose sum is σ = 198597120. Its totient is φ = 132305904.

The previous prime is 165439933. The next prime is 165440027. The reversal of 165439985 is 589934561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165439985 - 2¹² = 165435889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24176 + ... + 30254.

It is an arithmetic number, because the mean of its divisors is an integer number (24824640).

Almost surely, 2^165439985 is an apocalyptic number.

It is an amenable number.

165439985 is a deficient number, since it is larger than the sum of its proper divisors (33157135).

165439985 is an equidigital number, since it uses as much as digits as its factorization.

165439985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11527.

The product of its digits is 1166400, while the sum is 50.

The square root of 165439985 is about 12862.3475695535. The cubic root of 165439985 is about 548.9677442858.

The spelling of 165439985 in words is "one hundred sixty-five million, four hundred thirty-nine thousand, nine hundred eighty-five".