16105565605 has 4 divisors (see below), whose sum is σ = 19326678732. Its totient is φ = 12884452480.

The previous prime is 16105565573. The next prime is 16105565653. The reversal of 16105565605 is 50656550161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10742493316 + 5363072289 = 103646^2 + 73233^2 .

It is not a de Polignac number, because 16105565605 - 2⁵ = 16105565573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610556556 + ... + 1610556565.

It is an arithmetic number, because the mean of its divisors is an integer number (4831669683).

Almost surely, 2^16105565605 is an apocalyptic number.

It is an amenable number.

16105565605 is a deficient number, since it is larger than the sum of its proper divisors (3221113127).

16105565605 is an equidigital number, since it uses as much as digits as its factorization.

16105565605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221113126.

The product of its (nonzero) digits is 135000, while the sum is 40.

It can be divided in two parts, 1610556 and 5605, that added together give a palindrome (1616161).

The spelling of 16105565605 in words is "sixteen billion, one hundred five million, five hundred sixty-five thousand, six hundred five".