65686868656 has 40 divisors (see below), whose sum is σ = 128821665600. Its totient is φ = 32443276800.

The previous prime is 65686868651. The next prime is 65686868717.

65686868656 is nontrivially palindromic in base 10.

65686868656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (65686868651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1500681 + ... + 1543831.

It is an arithmetic number, because the mean of its divisors is an integer number (3220541640).

Almost surely, 2^65686868656 is an apocalyptic number.

It is an amenable number.

65686868656 is a deficient number, since it is larger than the sum of its proper divisors (63134796944).

65686868656 is a wasteful number, since it uses less digits than its factorization.

65686868656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44317 (or 44311 counting only the distinct ones).

The product of its digits is 597196800, while the sum is 70.

The spelling of 65686868656 in words is "sixty-five billion, six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred fifty-six".