6639449366 has 16 divisors (see below), whose sum is σ = 11215024128. Its totient is φ = 2920578600.

The previous prime is 6639449359. The next prime is 6639449371.

It is a happy number.

6639449366 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4866950 + ... + 4868313.

It is an arithmetic number, because the mean of its divisors is an integer number (700939008).

Almost surely, 2^6639449366 is an apocalyptic number.

6639449366 is a deficient number, since it is larger than the sum of its proper divisors (4575574762).

6639449366 is a wasteful number, since it uses less digits than its factorization.

6639449366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9735307.

The product of its digits is 15116544, while the sum is 56.

The square root of 6639449366 is about 81482.8163848059. The cubic root of 6639449366 is about 1879.5073182711.

The spelling of 6639449366 in words is "six billion, six hundred thirty-nine million, four hundred forty-nine thousand, three hundred sixty-six".