6636648816 has 120 divisors (see below), whose sum is σ = 22013007744. Its totient is φ = 1896177600.

The previous prime is 6636648773. The next prime is 6636648829. The reversal of 6636648816 is 6188466366.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94710 + ... + 149141.

Almost surely, 2^6636648816 is an apocalyptic number.

It is an amenable number.

6636648816 is an abundant number, since it is smaller than the sum of its proper divisors (15376358928).

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

6636648816 is a wasteful number, since it uses less digits than its factorization.

6636648816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243881 (or 243863 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 6636648816 is about 81465.6296606121. The cubic root of 6636648816 is about 1879.2430195228.

The spelling of 6636648816 in words is "six billion, six hundred thirty-six million, six hundred forty-eight thousand, eight hundred sixteen".