1105550005561 has 4 divisors (see below), whose sum is σ = 1105552170612. Its totient is φ = 1105547840512.

The previous prime is 1105550005541. The next prime is 1105550005579. The reversal of 1105550005561 is 1655000555011.

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 768680041536 + 336869964025 = 876744^2 + 580405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105550005561 - 2⁵ = 1105550005529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105550005501) 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, 155001 + ... + 1495033.

It is an arithmetic number, because the mean of its divisors is an integer number (276388042653).

Almost surely, 2^{1105550005561} is an apocalyptic number.

It is an amenable number.

1105550005561 is a deficient number, since it is larger than the sum of its proper divisors (2165051).

1105550005561 is an equidigital number, since it uses as much as digits as its factorization.

1105550005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165050.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 1105550005561 in words is "one trillion, one hundred five billion, five hundred fifty million, five thousand, five hundred sixty-one".