1105557580561 has 4 divisors (see below), whose sum is σ = 1263494377792. Its totient is φ = 947620783332.

The previous prime is 1105557580549. The next prime is 1105557580579. The reversal of 1105557580561 is 1650857555011.

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 not a de Polignac number, because 1105557580561 - 2³⁷ = 968118627089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105557580541) 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, 78968398605 + ... + 78968398618.

It is an arithmetic number, because the mean of its divisors is an integer number (315873594448).

Almost surely, 2^{1105557580561} is an apocalyptic number.

It is an amenable number.

1105557580561 is a deficient number, since it is larger than the sum of its proper divisors (157936797231).

1105557580561 is an equidigital number, since it uses as much as digits as its factorization.

1105557580561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157936797230.

The product of its (nonzero) digits is 1050000, while the sum is 49.

The spelling of 1105557580561 in words is "one trillion, one hundred five billion, five hundred fifty-seven million, five hundred eighty thousand, five hundred sixty-one".