6664606656 has 56 divisors (see below), whose sum is σ = 17656996944. Its totient is φ = 2218567680.

The previous prime is 6664606639. The next prime is 6664606691. The reversal of 6664606656 is 6566064666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6664606599 and 6664606608.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 123306 + ... + 168918.

Almost surely, 2^6664606656 is an apocalyptic number.

It is an amenable number.

6664606656 is an abundant number, since it is smaller than the sum of its proper divisors (10992390288).

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

6664606656 is a wasteful number, since it uses less digits than its factorization.

6664606656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46389 (or 46379 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 51.

The square root of 6664606656 is about 81637.0421806180. The cubic root of 6664606656 is about 1881.8781833658.

The spelling of 6664606656 in words is "six billion, six hundred sixty-four million, six hundred six thousand, six hundred fifty-six".