164605985 has 16 divisors (see below), whose sum is σ = 213601536. Its totient is φ = 121298688.

The previous prime is 164605981. The next prime is 164606017. The reversal of 164605985 is 589506461.

It is a cyclic number.

It is not a de Polignac number, because 164605985 - 2² = 164605981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164605981) 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 15 ways as a sum of consecutive naturals, for example, 16607 + ... + 24596.

It is an arithmetic number, because the mean of its divisors is an integer number (13350096).

Almost surely, 2^164605985 is an apocalyptic number.

It is an amenable number.

164605985 is a deficient number, since it is larger than the sum of its proper divisors (48995551).

164605985 is a wasteful number, since it uses less digits than its factorization.

164605985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41272.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 164605985 is about 12829.8863985618. The cubic root of 164605985 is about 548.0437222028.

The spelling of 164605985 in words is "one hundred sixty-four million, six hundred five thousand, nine hundred eighty-five".