12043205561 has 16 divisors (see below), whose sum is σ = 12470588928. Its totient is φ = 11622518400.

The previous prime is 12043205557. The next prime is 12043205621. The reversal of 12043205561 is 16550234021.

It is a cyclic number.

It is not a de Polignac number, because 12043205561 - 2² = 12043205557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12043205261) 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, 3784391 + ... + 3787571.

It is an arithmetic number, because the mean of its divisors is an integer number (779411808).

Almost surely, 2^12043205561 is an apocalyptic number.

It is an amenable number.

12043205561 is a deficient number, since it is larger than the sum of its proper divisors (427383367).

12043205561 is a wasteful number, since it uses less digits than its factorization.

12043205561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 12043205561 its reverse (16550234021), we get a palindrome (28593439582).

The spelling of 12043205561 in words is "twelve billion, forty-three million, two hundred five thousand, five hundred sixty-one".