65668009 has 16 divisors (see below), whose sum is σ = 77172480. Its totient is φ = 55233360.

The previous prime is 65667997. The next prime is 65668033. The reversal of 65668009 is 90086656.

65668009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 65668009 - 2¹¹ = 65665961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65668409) 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, 5334 + ... + 12640.

It is an arithmetic number, because the mean of its divisors is an integer number (4823280).

Almost surely, 2^65668009 is an apocalyptic number.

It is an amenable number.

65668009 is a deficient number, since it is larger than the sum of its proper divisors (11504471).

65668009 is a wasteful number, since it uses less digits than its factorization.

65668009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 65668009 is about 8103.5800113283. The cubic root of 65668009 is about 403.4452590285.

The spelling of 65668009 in words is "sixty-five million, six hundred sixty-eight thousand, nine".