65865664 has 14 divisors (see below), whose sum is σ = 130702304. Its totient is φ = 32932800.

The previous prime is 65865643. The next prime is 65865671. The reversal of 65865664 is 46656856.

65865664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 514512 + ... + 514639.

Almost surely, 2^65865664 is an apocalyptic number.

65865664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65865664 is a deficient number, since it is larger than the sum of its proper divisors (64836640).

65865664 is a wasteful number, since it uses less digits than its factorization.

65865664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029163 (or 1029153 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The square root of 65865664 is about 8115.7663840207. The cubic root of 65865664 is about 403.8496319793.

The spelling of 65865664 in words is "sixty-five million, eight hundred sixty-five thousand, six hundred sixty-four".