11255582561 has 4 divisors (see below), whose sum is σ = 11281577412. Its totient is φ = 11229587712.

The previous prime is 11255582549. The next prime is 11255582593. The reversal of 11255582561 is 16528555211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16528555211 = 7 ⋅2361222173.

It can be written as a sum of positive squares in 2 ways, for example, as 516198400 + 10739384161 = 22720^2 + 103631^2 .

It is a cyclic number.

It is not a de Polignac number, because 11255582561 - 2⁶ = 11255582497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11255582861) 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, 12996776 + ... + 12997641.

It is an arithmetic number, because the mean of its divisors is an integer number (2820394353).

Almost surely, 2^11255582561 is an apocalyptic number.

It is an amenable number.

11255582561 is a deficient number, since it is larger than the sum of its proper divisors (25994851).

11255582561 is an equidigital number, since it uses as much as digits as its factorization.

11255582561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25994850.

The product of its digits is 120000, while the sum is 41.

The spelling of 11255582561 in words is "eleven billion, two hundred fifty-five million, five hundred eighty-two thousand, five hundred sixty-one".