6639543347896 has 16 divisors (see below), whose sum is σ = 12752781431040. Its totient is φ = 3238801632960.

The previous prime is 6639543347881. The next prime is 6639543347989. The reversal of 6639543347896 is 6987433459366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10121254776 + ... + 10121255431.

It is an arithmetic number, because the mean of its divisors is an integer number (797048839440).

Almost surely, 2^{6639543347896} is an apocalyptic number.

It is an amenable number.

6639543347896 is a deficient number, since it is larger than the sum of its proper divisors (6113238083144).

6639543347896 is a wasteful number, since it uses less digits than its factorization.

6639543347896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20242510254 (or 20242510250 counting only the distinct ones).

The product of its digits is 2116316160, while the sum is 73.

The spelling of 6639543347896 in words is "six trillion, six hundred thirty-nine billion, five hundred forty-three million, three hundred forty-seven thousand, eight hundred ninety-six".