105561105505 has 4 divisors (see below), whose sum is σ = 126673326612. Its totient is φ = 84448884400.

The previous prime is 105561105491. The next prime is 105561105577. The reversal of 105561105505 is 505501165501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505501165501 = 232513 ⋅2174077.

It can be written as a sum of positive squares in 2 ways, for example, as 45864933921 + 59696171584 = 214161^2 + 244328^2 .

It is not a de Polignac number, because 105561105505 - 2⁵ = 105561105473 is a prime.

It is a super-2 number, since 2×105561105505² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10556110546 + ... + 10556110555.

It is an arithmetic number, because the mean of its divisors is an integer number (31668331653).

Almost surely, 2^105561105505 is an apocalyptic number.

It is an amenable number.

105561105505 is a deficient number, since it is larger than the sum of its proper divisors (21112221107).

105561105505 is an equidigital number, since it uses as much as digits as its factorization.

105561105505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21112221106.

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

The spelling of 105561105505 in words is "one hundred five billion, five hundred sixty-one million, one hundred five thousand, five hundred five".