6639471111 has 96 divisors (see below), whose sum is σ = 11603450880. Its totient is φ = 3281845248.

The previous prime is 6639471109. The next prime is 6639471133. The reversal of 6639471111 is 1111749366.

It is not a de Polignac number, because 6639471111 - 2¹ = 6639471109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 6639471111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639471191) 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 95 ways as a sum of consecutive naturals, for example, 60912525 + ... + 60912633.

It is an arithmetic number, because the mean of its divisors is an integer number (120869280).

Almost surely, 2^6639471111 is an apocalyptic number.

6639471111 is a deficient number, since it is larger than the sum of its proper divisors (4963979769).

6639471111 is a wasteful number, since it uses less digits than its factorization.

6639471111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 244 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 6639471111 is about 81482.9498177379. The cubic root of 6639471111 is about 1879.5093701402.

The spelling of 6639471111 in words is "six billion, six hundred thirty-nine million, four hundred seventy-one thousand, one hundred eleven".