11133404561 has 4 divisors (see below), whose sum is σ = 11343468852. Its totient is φ = 10923340272.

The previous prime is 11133404519. The next prime is 11133404591. The reversal of 11133404561 is 16540433111.

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 5693457025 + 5439947536 = 75455^2 + 73756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11133404561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11133404591) 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, 105032066 + ... + 105032171.

It is an arithmetic number, because the mean of its divisors is an integer number (2835867213).

Almost surely, 2^11133404561 is an apocalyptic number.

It is an amenable number.

11133404561 is a deficient number, since it is larger than the sum of its proper divisors (210064291).

11133404561 is an equidigital number, since it uses as much as digits as its factorization.

11133404561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210064290.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 11133404561 its reverse (16540433111), we get a palindrome (27673837672).

The spelling of 11133404561 in words is "eleven billion, one hundred thirty-three million, four hundred four thousand, five hundred sixty-one".