5605516561 has 4 divisors (see below), whose sum is σ = 5606556400. Its totient is φ = 5604476724.

The previous prime is 5605516547. The next prime is 5605516571. The reversal of 5605516561 is 1656155065.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5605516561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5605516531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511791 + ... + 522628.

It is an arithmetic number, because the mean of its divisors is an integer number (1401639100).

Almost surely, 2^5605516561 is an apocalyptic number.

It is an amenable number.

5605516561 is a deficient number, since it is larger than the sum of its proper divisors (1039839).

5605516561 is a wasteful number, since it uses less digits than its factorization.

5605516561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039838.

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

The square root of 5605516561 is about 74869.9977360758. The cubic root of 5605516561 is about 1776.3909283744.

The spelling of 5605516561 in words is "five billion, six hundred five million, five hundred sixteen thousand, five hundred sixty-one".