65646664656 has 40 divisors (see below), whose sum is σ = 169730234784. Its totient is φ = 21863767680.

The previous prime is 65646664649. The next prime is 65646664669.

65646664656 is nontrivially palindromic in base 10.

65646664656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 65646664656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519115 + ... + 633066.

Almost surely, 2^65646664656 is an apocalyptic number.

It is an amenable number.

65646664656 is an abundant number, since it is smaller than the sum of its proper divisors (104083570128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65646664656 is a wasteful number, since it uses less digits than its factorization.

65646664656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153379 (or 1153373 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 60.

The spelling of 65646664656 in words is "sixty-five billion, six hundred forty-six million, six hundred sixty-four thousand, six hundred fifty-six".