11534033561 has 4 divisors (see below), whose sum is σ = 11541395712. Its totient is φ = 11526671412.

The previous prime is 11534033551. The next prime is 11534033597. The reversal of 11534033561 is 16533043511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11534033561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11534033551) 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, 3678725 + ... + 3681858.

It is an arithmetic number, because the mean of its divisors is an integer number (2885348928).

Almost surely, 2^11534033561 is an apocalyptic number.

It is an amenable number.

11534033561 is a deficient number, since it is larger than the sum of its proper divisors (7362151).

11534033561 is an equidigital number, since it uses as much as digits as its factorization.

11534033561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362150.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 11534033561 in words is "eleven billion, five hundred thirty-four million, thirty-three thousand, five hundred sixty-one".