85665009 has 16 divisors (see below), whose sum is σ = 115580160. Its totient is φ = 56434560.

The previous prime is 85664983. The next prime is 85665011. The reversal of 85665009 is 90056658.

It is not a de Polignac number, because 85665009 - 2⁹ = 85664497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85665029) 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, 112189 + ... + 112949.

It is an arithmetic number, because the mean of its divisors is an integer number (7223760).

Almost surely, 2^85665009 is an apocalyptic number.

It is an amenable number.

85665009 is a deficient number, since it is larger than the sum of its proper divisors (29915151).

85665009 is a wasteful number, since it uses less digits than its factorization.

85665009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 85665009 is about 9255.5393683999. The cubic root of 85665009 is about 440.8266295755.

The spelling of 85665009 in words is "eighty-five million, six hundred sixty-five thousand, nine".