6616561105 has 32 divisors (see below), whose sum is σ = 10218405888. Its totient is φ = 3991550400.

The previous prime is 6616561103. The next prime is 6616561123. The reversal of 6616561105 is 5011656166.

It is not a de Polignac number, because 6616561105 - 2¹ = 6616561103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6616561103) 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, 265257 + ... + 289126.

It is an arithmetic number, because the mean of its divisors is an integer number (319325184).

Almost surely, 2^6616561105 is an apocalyptic number.

It is an amenable number.

6616561105 is a deficient number, since it is larger than the sum of its proper divisors (3601844783).

6616561105 is a wasteful number, since it uses less digits than its factorization.

6616561105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554437.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 6616561105 is about 81342.2467417762. The cubic root of 6616561105 is about 1877.3450816411.

The spelling of 6616561105 in words is "six billion, six hundred sixteen million, five hundred sixty-one thousand, one hundred five".