6636994668 has 36 divisors (see below), whose sum is σ = 16861171600. Its totient is φ = 2201211936.

The previous prime is 6636994643. The next prime is 6636994669. The reversal of 6636994668 is 8664996366.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (6636994669) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 456055 + ... + 470382.

Almost surely, 2^6636994668 is an apocalyptic number.

It is an amenable number.

6636994668 is an abundant number, since it is smaller than the sum of its proper divisors (10224176932).

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

6636994668 is a wasteful number, since it uses less digits than its factorization.

6636994668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926646 (or 926641 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 63.

The square root of 6636994668 is about 81467.7523195528. The cubic root of 6636994668 is about 1879.2756629389.

The spelling of 6636994668 in words is "six billion, six hundred thirty-six million, nine hundred ninety-four thousand, six hundred sixty-eight".