6559138944 has 160 divisors (see below), whose sum is σ = 19608969600. Its totient is φ = 2176409088.

The previous prime is 6559138939. The next prime is 6559139021. The reversal of 6559138944 is 4498319556.

6559138944 is a `hidden beast` number, since 6 + 5 + 591 + 3 + 8 + 9 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2476629 + ... + 2479275.

It is an arithmetic number, because the mean of its divisors is an integer number (122556060).

Almost surely, 2^6559138944 is an apocalyptic number.

6559138944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6559138944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9804484800).

6559138944 is an abundant number, since it is smaller than the sum of its proper divisors (13049830656).

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

6559138944 is a wasteful number, since it uses less digits than its factorization.

6559138944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912 (or 2891 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 6559138944 is about 80988.5111852292. The cubic root of 6559138944 is about 1871.8984165784.

The spelling of 6559138944 in words is "six billion, five hundred fifty-nine million, one hundred thirty-eight thousand, nine hundred forty-four".