6638543384 has 32 divisors (see below), whose sum is σ = 14377597200. Its totient is φ = 2840017920.

The previous prime is 6638543363. The next prime is 6638543389. The reversal of 6638543384 is 4833458366.

It is a super-2 number, since 2×6638543384² = 88140516522500342912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638543389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2217269 + ... + 2220260.

Almost surely, 2^6638543384 is an apocalyptic number.

It is an amenable number.

6638543384 is an abundant number, since it is smaller than the sum of its proper divisors (7739053816).

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

6638543384 is a wasteful number, since it uses less digits than its factorization.

6638543384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437563 (or 4437559 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 50.

The square root of 6638543384 is about 81477.2568512220. The cubic root of 6638543384 is about 1879.4218253754.

The spelling of 6638543384 in words is "six billion, six hundred thirty-eight million, five hundred forty-three thousand, three hundred eighty-four".