65666864 has 20 divisors (see below), whose sum is σ = 127410000. Its totient is φ = 32786880.

The previous prime is 65666857. The next prime is 65666873. The reversal of 65666864 is 46866656.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10637 + ... + 15635.

It is an arithmetic number, because the mean of its divisors is an integer number (6370500).

Almost surely, 2^65666864 is an apocalyptic number.

It is an amenable number.

65666864 is a deficient number, since it is larger than the sum of its proper divisors (61743136).

65666864 is a wasteful number, since it uses less digits than its factorization.

65666864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5828 (or 5822 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 47.

The square root of 65666864 is about 8103.5093632327. The cubic root of 65666864 is about 403.4429141653.

The spelling of 65666864 in words is "sixty-five million, six hundred sixty-six thousand, eight hundred sixty-four".