6644897056 has 144 divisors (see below), whose sum is σ = 16262920800. Its totient is φ = 2656862208.

The previous prime is 6644897011. The next prime is 6644897111. The reversal of 6644897056 is 6507984466.

It is a junction number, because it is equal to n+sod(n) for n = 6644896988 and 6644897006.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1994400 + ... + 1997728.

It is an arithmetic number, because the mean of its divisors is an integer number (112936950).

Almost surely, 2^6644897056 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 6644897056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8131460400).

6644897056 is an abundant number, since it is smaller than the sum of its proper divisors (9618023744).

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

6644897056 is a wasteful number, since it uses less digits than its factorization.

6644897056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439 (or 3424 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The square root of 6644897056 is about 81516.2379897404. The cubic root of 6644897056 is about 1880.0212250508.

The spelling of 6644897056 in words is "six billion, six hundred forty-four million, eight hundred ninety-seven thousand, fifty-six".