6439663418 has 16 divisors (see below), whose sum is σ = 10404619776. Its totient is φ = 2980488720.

The previous prime is 6439663381. The next prime is 6439663421. The reversal of 6439663418 is 8143669346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2256521 + ... + 2259372.

It is an arithmetic number, because the mean of its divisors is an integer number (650288736).

Almost surely, 2^6439663418 is an apocalyptic number.

6439663418 is a deficient number, since it is larger than the sum of its proper divisors (3964956358).

6439663418 is a wasteful number, since it uses less digits than its factorization.

6439663418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515949.

The product of its digits is 2239488, while the sum is 50.

The square root of 6439663418 is about 80247.5134692658. The cubic root of 6439663418 is about 1860.4630806360.

The spelling of 6439663418 in words is "six billion, four hundred thirty-nine million, six hundred sixty-three thousand, four hundred eighteen".