6644115520 has 224 divisors, whose sum is σ = 18614550528. Its totient is φ = 2211674112.

The previous prime is 6644115503. The next prime is 6644115523. The reversal of 6644115520 is 255114466.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (6644115523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23477299 + ... + 23477581.

It is an arithmetic number, because the mean of its divisors is an integer number (83100672).

Almost surely, 2^6644115520 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 6644115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9307275264).

6644115520 is an abundant number, since it is smaller than the sum of its proper divisors (11970435008).

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

6644115520 is a wasteful number, since it uses less digits than its factorization.

6644115520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 6644115520 is about 81511.4441044937. Note that the first 3 decimals coincide. The cubic root of 6644115520 is about 1879.9475162653.

Adding to 6644115520 its reverse (255114466), we get a palindrome (6899229986).

The spelling of 6644115520 in words is "six billion, six hundred forty-four million, one hundred fifteen thousand, five hundred twenty".