5665565105561 has 4 divisors (see below), whose sum is σ = 5715702849972. Its totient is φ = 5615427361152.

The previous prime is 5665565105509. The next prime is 5665565105569. The reversal of 5665565105561 is 1655015655665.

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 2964144145561 + 2701420960000 = 1721669^2 + 1643600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5665565105561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5665565105497 and 5665565105506.

It is not an unprimeable number, because it can be changed into a prime (5665565105569) 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, 25068872036 + ... + 25068872261.

It is an arithmetic number, because the mean of its divisors is an integer number (1428925712493).

Almost surely, 2^{5665565105561} is an apocalyptic number.

It is an amenable number.

5665565105561 is a deficient number, since it is larger than the sum of its proper divisors (50137744411).

5665565105561 is a wasteful number, since it uses less digits than its factorization.

5665565105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50137744410.

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 5665565105561 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-five million, one hundred five thousand, five hundred sixty-one".