1105561066561 has 4 divisors (see below), whose sum is σ = 1263498361792. Its totient is φ = 947623771332.

The previous prime is 1105561066529. The next prime is 1105561066591. The reversal of 1105561066561 is 1656601655011.

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 not a de Polignac number, because 1105561066561 - 2⁵ = 1105561066529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105561066591) 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, 78968647605 + ... + 78968647618.

It is an arithmetic number, because the mean of its divisors is an integer number (315874590448).

Almost surely, 2^{1105561066561} is an apocalyptic number.

It is an amenable number.

1105561066561 is a deficient number, since it is larger than the sum of its proper divisors (157937295231).

1105561066561 is an equidigital number, since it uses as much as digits as its factorization.

1105561066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157937295230.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 1105561066561 in words is "one trillion, one hundred five billion, five hundred sixty-one million, sixty-six thousand, five hundred sixty-one".