1105605560561 has 4 divisors (see below), whose sum is σ = 1107548628900. Its totient is φ = 1103662492224.

The previous prime is 1105605560537. The next prime is 1105605560567. The reversal of 1105605560561 is 1650655065011.

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 476707393600 + 628898166961 = 690440^2 + 793031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105605560561 - 2¹⁸ = 1105605298417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105605560567) by changing a digit.

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, 971533316 + ... + 971534453.

It is an arithmetic number, because the mean of its divisors is an integer number (276887157225).

Almost surely, 2^{1105605560561} is an apocalyptic number.

It is an amenable number.

1105605560561 is a deficient number, since it is larger than the sum of its proper divisors (1943068339).

1105605560561 is an equidigital number, since it uses as much as digits as its factorization.

1105605560561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943068338.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 1105605560561 in words is "one trillion, one hundred five billion, six hundred five million, five hundred sixty thousand, five hundred sixty-one".