6639063279 has 4 divisors (see below), whose sum is σ = 8852084376. Its totient is φ = 4426042184.

The previous prime is 6639063269. The next prime is 6639063287. The reversal of 6639063279 is 9723609366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6639063279 - 2⁹ = 6639062767 is a prime.

It is a super-2 number, since 2×6639063279² = 88154322445132463682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639063259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106510544 + ... + 1106510549.

It is an arithmetic number, because the mean of its divisors is an integer number (2213021094).

Almost surely, 2^6639063279 is an apocalyptic number.

6639063279 is a deficient number, since it is larger than the sum of its proper divisors (2213021097).

6639063279 is a wasteful number, since it uses less digits than its factorization.

6639063279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213021096.

The product of its (nonzero) digits is 2204496, while the sum is 51.

The square root of 6639063279 is about 81480.4472189494. The cubic root of 6639063279 is about 1879.4708861632.

The spelling of 6639063279 in words is "six billion, six hundred thirty-nine million, sixty-three thousand, two hundred seventy-nine".