6638309278211 has 16 divisors (see below), whose sum is σ = 7232985396000. Its totient is φ = 6055709138688.

The previous prime is 6638309278129. The next prime is 6638309278247. The reversal of 6638309278211 is 1128729038366.

It is a cyclic number.

It is not a de Polignac number, because 6638309278211 - 2¹⁴ = 6638309261827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6638302278211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 783080 + ... + 3726906.

It is an arithmetic number, because the mean of its divisors is an integer number (452061587250).

Almost surely, 2^{6638309278211} is an apocalyptic number.

6638309278211 is a deficient number, since it is larger than the sum of its proper divisors (594676117789).

6638309278211 is a wasteful number, since it uses less digits than its factorization.

6638309278211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945878.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 6638309278211 in words is "six trillion, six hundred thirty-eight billion, three hundred nine million, two hundred seventy-eight thousand, two hundred eleven".