6444430816 has 12 divisors (see below), whose sum is σ = 12687473232. Its totient is φ = 3222215392.

The previous prime is 6444430813. The next prime is 6444430891. The reversal of 6444430816 is 6180344446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444430813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100694200 + ... + 100694263.

It is an arithmetic number, because the mean of its divisors is an integer number (1057289436).

Almost surely, 2^6444430816 is an apocalyptic number.

It is an amenable number.

6444430816 is a deficient number, since it is larger than the sum of its proper divisors (6243042416).

6444430816 is a wasteful number, since it uses less digits than its factorization.

6444430816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201388473 (or 201388465 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 6444430816 is about 80277.2123083506. The cubic root of 6444430816 is about 1860.9220787506.

The spelling of 6444430816 in words is "six billion, four hundred forty-four million, four hundred thirty thousand, eight hundred sixteen".