11055455561 has 4 divisors (see below), whose sum is σ = 11058273300. Its totient is φ = 11052637824.

The previous prime is 11055455549. The next prime is 11055455591. The reversal of 11055455561 is 16555455011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6759963961 + 4295491600 = 82219^2 + 65540^2 .

It is a cyclic number.

It is not a de Polignac number, because 11055455561 - 2³⁰ = 9981713737 is a prime.

It is a super-2 number, since 2×11055455561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11055455591) 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, 1402976 + ... + 1410833.

It is an arithmetic number, because the mean of its divisors is an integer number (2764568325).

Almost surely, 2^11055455561 is an apocalyptic number.

It is an amenable number.

11055455561 is a deficient number, since it is larger than the sum of its proper divisors (2817739).

11055455561 is an equidigital number, since it uses as much as digits as its factorization.

11055455561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817738.

The product of its (nonzero) digits is 75000, while the sum is 38.

The spelling of 11055455561 in words is "eleven billion, fifty-five million, four hundred fifty-five thousand, five hundred sixty-one".