65664913 has 8 divisors (see below), whose sum is σ = 69360896. Its totient is φ = 62067600.

The previous prime is 65664889. The next prime is 65664941. The reversal of 65664913 is 31946656.

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 65664913 - 2²¹ = 63567761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65664943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23298 + ... + 25963.

It is an arithmetic number, because the mean of its divisors is an integer number (8670112).

Almost surely, 2^65664913 is an apocalyptic number.

It is an amenable number.

65664913 is a deficient number, since it is larger than the sum of its proper divisors (3695983).

65664913 is a wasteful number, since it uses less digits than its factorization.

65664913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49335.

The product of its digits is 116640, while the sum is 40.

The square root of 65664913 is about 8103.3889823950. The cubic root of 65664913 is about 403.4389186193.

The spelling of 65664913 in words is "sixty-five million, six hundred sixty-four thousand, nine hundred thirteen".