11056543561 has 8 divisors (see below), whose sum is σ = 12648731840. Its totient is φ = 9467525808.

The previous prime is 11056543559. The next prime is 11056543571. The reversal of 11056543561 is 16534565011.

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 11056543561 - 2¹ = 11056543559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11056543561.

It is not an unprimeable number, because it can be changed into a prime (11056543541) 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, 785151 + ... + 799108.

It is an arithmetic number, because the mean of its divisors is an integer number (1581091480).

Almost surely, 2^11056543561 is an apocalyptic number.

It is an amenable number.

11056543561 is a deficient number, since it is larger than the sum of its proper divisors (1592188279).

11056543561 is an equidigital number, since it uses as much as digits as its factorization.

11056543561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585263.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 11056543561 in words is "eleven billion, fifty-six million, five hundred forty-three thousand, five hundred sixty-one".