6566611444 has 12 divisors (see below), whose sum is σ = 11532467268. Its totient is φ = 3271620800.

The previous prime is 6566611321. The next prime is 6566611477. The reversal of 6566611444 is 4441166656.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3241935844 + 3324675600 = 56938^2 + 57660^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6566611444.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2919967 + ... + 2922214.

It is an arithmetic number, because the mean of its divisors is an integer number (961038939).

Almost surely, 2^6566611444 is an apocalyptic number.

It is an amenable number.

6566611444 is a deficient number, since it is larger than the sum of its proper divisors (4965855824).

6566611444 is a wasteful number, since it uses less digits than its factorization.

6566611444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5842466 (or 5842464 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 6566611444 is about 81034.6311400256. The cubic root of 6566611444 is about 1872.6090003173.

The spelling of 6566611444 in words is "six billion, five hundred sixty-six million, six hundred eleven thousand, four hundred forty-four".