561110105555 has 4 divisors (see below), whose sum is σ = 673332126672. Its totient is φ = 448888084440.

The previous prime is 561110105551. The next prime is 561110105573. The reversal of 561110105555 is 555501011165.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 561110105555 - 2² = 561110105551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561110105551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56111010551 + ... + 56111010560.

It is an arithmetic number, because the mean of its divisors is an integer number (168333031668).

Almost surely, 2^561110105555 is an apocalyptic number.

561110105555 is a deficient number, since it is larger than the sum of its proper divisors (112222021117).

561110105555 is a wasteful number, since it uses less digits than its factorization.

561110105555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112222021116.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 561110105555 in words is "five hundred sixty-one billion, one hundred ten million, one hundred five thousand, five hundred fifty-five".