105561010561 has 4 divisors (see below), whose sum is σ = 105565335472. Its totient is φ = 105556685652.

The previous prime is 105561010547. The next prime is 105561010613. The reversal of 105561010561 is 165010165501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165010165501 = 44839 ⋅3680059.

It is a cyclic number.

It is not a de Polignac number, because 105561010561 - 2³³ = 96971075969 is a prime.

It is a super-2 number, since 2×105561010561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105561010501) 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, 2125635 + ... + 2174728.

It is an arithmetic number, because the mean of its divisors is an integer number (26391333868).

Almost surely, 2^105561010561 is an apocalyptic number.

It is an amenable number.

105561010561 is a deficient number, since it is larger than the sum of its proper divisors (4324911).

105561010561 is an equidigital number, since it uses as much as digits as its factorization.

105561010561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324910.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 105561010561 in words is "one hundred five billion, five hundred sixty-one million, ten thousand, five hundred sixty-one".