6644722256 has 80 divisors (see below), whose sum is σ = 14050618560. Its totient is φ = 3033262080.

The previous prime is 6644722213. The next prime is 6644722267. The reversal of 6644722256 is 6522274466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1200776 + ... + 1206296.

It is an arithmetic number, because the mean of its divisors is an integer number (175632732).

Almost surely, 2^6644722256 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 6644722256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7025309280).

6644722256 is an abundant number, since it is smaller than the sum of its proper divisors (7405896304).

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

6644722256 is a wasteful number, since it uses less digits than its factorization.

6644722256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692 (or 5686 counting only the distinct ones).

The product of its digits is 967680, while the sum is 44.

The square root of 6644722256 is about 81515.1658036712. The cubic root of 6644722256 is about 1880.0047396893.

The spelling of 6644722256 in words is "six billion, six hundred forty-four million, seven hundred twenty-two thousand, two hundred fifty-six".