6439802913 has 16 divisors (see below), whose sum is σ = 9955251840. Its totient is φ = 4106540592.

The previous prime is 6439802893. The next prime is 6439802927. The reversal of 6439802913 is 3192089346.

It is a happy number.

It is not a de Polignac number, because 6439802913 - 2⁶ = 6439802849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6439802933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5184406 + ... + 5185647.

It is an arithmetic number, because the mean of its divisors is an integer number (622203240).

Almost surely, 2^6439802913 is an apocalyptic number.

It is an amenable number.

6439802913 is a deficient number, since it is larger than the sum of its proper divisors (3515448927).

6439802913 is a wasteful number, since it uses less digits than its factorization.

6439802913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370085 (or 10370079 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 6439802913 is about 80248.3826192154. The cubic root of 6439802913 is about 1860.4765142275.

The spelling of 6439802913 in words is "six billion, four hundred thirty-nine million, eight hundred two thousand, nine hundred thirteen".