65856009 has 4 divisors (see below), whose sum is σ = 87808016. Its totient is φ = 43904004.

The previous prime is 65855987. The next prime is 65856017. The reversal of 65856009 is 90065856.

65856009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65856009 - 2⁸ = 65855753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65856019) 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 3 ways as a sum of consecutive naturals, for example, 10975999 + ... + 10976004.

It is an arithmetic number, because the mean of its divisors is an integer number (21952004).

Almost surely, 2^65856009 is an apocalyptic number.

It is an amenable number.

65856009 is a deficient number, since it is larger than the sum of its proper divisors (21952007).

65856009 is a wasteful number, since it uses less digits than its factorization.

65856009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21952006.

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

The square root of 65856009 is about 8115.1715323830. The cubic root of 65856009 is about 403.8298980821.

The spelling of 65856009 in words is "sixty-five million, eight hundred fifty-six thousand, nine".