6639851272 has 32 divisors (see below), whose sum is σ = 12933043200. Its totient is φ = 3193321600.

The previous prime is 6639851263. The next prime is 6639851311. The reversal of 6639851272 is 2721589366.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 119272 + ... + 165847.

It is an arithmetic number, because the mean of its divisors is an integer number (404157600).

Almost surely, 2^6639851272 is an apocalyptic number.

It is an amenable number.

6639851272 is a deficient number, since it is larger than the sum of its proper divisors (6293191928).

6639851272 is a wasteful number, since it uses less digits than its factorization.

6639851272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285237 (or 285233 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 6639851272 is about 81485.2825484455. The cubic root of 6639851272 is about 1879.5452415981.

The spelling of 6639851272 in words is "six billion, six hundred thirty-nine million, eight hundred fifty-one thousand, two hundred seventy-two".