6566381028 has 72 divisors (see below), whose sum is σ = 17188287480. Its totient is φ = 2111155200.

The previous prime is 6566381027. The next prime is 6566381039. The reversal of 6566381028 is 8201836656.

6566381028 is a `hidden beast` number, since 6 + 5 + 6 + 638 + 1 + 0 + 2 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 343064484 + 6223316544 = 18522^2 + 78888^2 .

It is not an unprimeable number, because it can be changed into a prime (6566381023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1251226 + ... + 1256462.

It is an arithmetic number, because the mean of its divisors is an integer number (238726215).

Almost surely, 2^6566381028 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 6566381028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8594143740).

6566381028 is an abundant number, since it is smaller than the sum of its proper divisors (10621906452).

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

6566381028 is a wasteful number, since it uses less digits than its factorization.

6566381028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477 (or 6472 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 6566381028 is about 81033.2094144123. The cubic root of 6566381028 is about 1872.5870973858.

The spelling of 6566381028 in words is "six billion, five hundred sixty-six million, three hundred eighty-one thousand, twenty-eight".