6559942816 has 72 divisors (see below), whose sum is σ = 15040185300. Its totient is φ = 2808271872.

The previous prime is 6559942799. The next prime is 6559942817. The reversal of 6559942816 is 6182499556.

It can be written as a sum of positive squares in 2 ways, for example, as 4172643216 + 2387299600 = 64596^2 + 48860^2 .

It is not an unprimeable number, because it can be changed into a prime (6559942817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1900260 + ... + 1903708.

Almost surely, 2^6559942816 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 6559942816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7520092650).

6559942816 is an abundant number, since it is smaller than the sum of its proper divisors (8480242484).

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

6559942816 is a wasteful number, since it uses less digits than its factorization.

6559942816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686 (or 4671 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 55.

The square root of 6559942816 is about 80993.4739099392. The cubic root of 6559942816 is about 1871.9748852159.

The spelling of 6559942816 in words is "six billion, five hundred fifty-nine million, nine hundred forty-two thousand, eight hundred sixteen".