11055510561 has 4 divisors (see below), whose sum is σ = 14740680752. Its totient is φ = 7370340372.

The previous prime is 11055510541. The next prime is 11055510577. The reversal of 11055510561 is 16501555011.

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: 16501555011 = 3 ⋅5500518337.

It is not a de Polignac number, because 11055510561 - 2¹³ = 11055502369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11055510541) 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, 1842585091 + ... + 1842585096.

It is an arithmetic number, because the mean of its divisors is an integer number (3685170188).

Almost surely, 2^11055510561 is an apocalyptic number.

It is an amenable number.

11055510561 is a deficient number, since it is larger than the sum of its proper divisors (3685170191).

11055510561 is an equidigital number, since it uses as much as digits as its factorization.

11055510561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685170190.

The product of its (nonzero) digits is 3750, while the sum is 30.

The spelling of 11055510561 in words is "eleven billion, fifty-five million, five hundred ten thousand, five hundred sixty-one".