6644746368 has 384 divisors, whose sum is σ = 21813442560. Its totient is φ = 1926144000.

The previous prime is 6644746363. The next prime is 6644746399. The reversal of 6644746368 is 8636474466.

It is a tau number, because it is divible by the number of its divisors (384).

It is not an unprimeable number, because it can be changed into a prime (6644746363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34789153 + ... + 34789343.

It is an arithmetic number, because the mean of its divisors is an integer number (56805840).

Almost surely, 2^6644746368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6644746368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10906721280).

6644746368 is an abundant number, since it is smaller than the sum of its proper divisors (15168696192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6644746368 is a wasteful number, since it uses less digits than its factorization.

6644746368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 333 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 54.

The square root of 6644746368 is about 81515.3137023958. The cubic root of 6644746368 is about 1880.0070137055.

The spelling of 6644746368 in words is "six billion, six hundred forty-four million, seven hundred forty-six thousand, three hundred sixty-eight".