11056005561 has 8 divisors (see below), whose sum is σ = 14758914240. Its totient is φ = 7361883632.

The previous prime is 11056005547. The next prime is 11056005577. The reversal of 11056005561 is 16550065011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11056005561 - 2⁵ = 11056005529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11056005161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2193750 + ... + 2198783.

It is an arithmetic number, because the mean of its divisors is an integer number (1844864280).

Almost surely, 2^11056005561 is an apocalyptic number.

It is an amenable number.

11056005561 is a deficient number, since it is larger than the sum of its proper divisors (3702908679).

11056005561 is an equidigital number, since it uses as much as digits as its factorization.

11056005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393375.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 11056005561 in words is "eleven billion, fifty-six million, five thousand, five hundred sixty-one".