6636856384 has 28 divisors (see below), whose sum is σ = 13172626944. Its totient is φ = 3317769344.

The previous prime is 6636856381. The next prime is 6636856531. The reversal of 6636856384 is 4836586366.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6636856381) 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 3 ways as a sum of consecutive naturals, for example, 556209 + ... + 568015.

Almost surely, 2^6636856384 is an apocalyptic number.

6636856384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6636856384 is a deficient number, since it is larger than the sum of its proper divisors (6535770560).

6636856384 is a wasteful number, since it uses less digits than its factorization.

6636856384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20602 (or 20592 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 55.

The square root of 6636856384 is about 81466.9036112212. The cubic root of 6636856384 is about 1879.2626110696.

The spelling of 6636856384 in words is "six billion, six hundred thirty-six million, eight hundred fifty-six thousand, three hundred eighty-four".