11553040561 has 16 divisors (see below), whose sum is σ = 12070684800. Its totient is φ = 11043574528.

The previous prime is 11553040529. The next prime is 11553040579. The reversal of 11553040561 is 16504035511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11553040561 - 2⁵ = 11553040529 is a prime.

It is a super-2 number, since 2×11553040561² (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 (11553040511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4478370 + ... + 4480948.

It is an arithmetic number, because the mean of its divisors is an integer number (754417800).

Almost surely, 2^11553040561 is an apocalyptic number.

It is an amenable number.

11553040561 is a deficient number, since it is larger than the sum of its proper divisors (517644239).

11553040561 is a wasteful number, since it uses less digits than its factorization.

11553040561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 11553040561 in words is "eleven billion, five hundred fifty-three million, forty thousand, five hundred sixty-one".