6639889366 has 32 divisors (see below), whose sum is σ = 11401171200. Its totient is φ = 2870741280.

The previous prime is 6639889339. The next prime is 6639889367.

6639889366 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6639889298 and 6639889307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639889367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53920 + ... + 127228.

It is an arithmetic number, because the mean of its divisors is an integer number (356286600).

Almost surely, 2^6639889366 is an apocalyptic number.

6639889366 is a deficient number, since it is larger than the sum of its proper divisors (4761281834).

6639889366 is a wasteful number, since it uses less digits than its factorization.

6639889366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73524.

The product of its digits is 60466176, while the sum is 64.

The square root of 6639889366 is about 81485.5162958424. The cubic root of 6639889366 is about 1879.5488360189.

The spelling of 6639889366 in words is "six billion, six hundred thirty-nine million, eight hundred eighty-nine thousand, three hundred sixty-six".