11055100561 has 4 divisors (see below), whose sum is σ = 11705400612. Its totient is φ = 10404800512.

The previous prime is 11055100549. The next prime is 11055100583. The reversal of 11055100561 is 16500155011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16500155011 = 2749 ⋅6002239.

It can be written as a sum of positive squares in 2 ways, for example, as 9342382336 + 1712718225 = 96656^2 + 41385^2 .

It is a cyclic number.

It is not a de Polignac number, because 11055100561 - 2¹¹ = 11055098513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11055100261) 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, 325150000 + ... + 325150033.

It is an arithmetic number, because the mean of its divisors is an integer number (2926350153).

Almost surely, 2^11055100561 is an apocalyptic number.

It is an amenable number.

11055100561 is a deficient number, since it is larger than the sum of its proper divisors (650300051).

11055100561 is an equidigital number, since it uses as much as digits as its factorization.

11055100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650300050.

The product of its (nonzero) digits is 750, while the sum is 25.

Adding to 11055100561 its reverse (16500155011), we get a palindrome (27555255572).

The spelling of 11055100561 in words is "eleven billion, fifty-five million, one hundred thousand, five hundred sixty-one".