12026561561 has 16 divisors (see below), whose sum is σ = 13947568128. Its totient is φ = 10156482000.

The previous prime is 12026561539. The next prime is 12026561629. The reversal of 12026561561 is 16516562021.

It is not a de Polignac number, because 12026561561 - 2¹⁰ = 12026560537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12026561501) 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, 819236 + ... + 833786.

It is an arithmetic number, because the mean of its divisors is an integer number (871723008).

Almost surely, 2^12026561561 is an apocalyptic number.

It is an amenable number.

12026561561 is a deficient number, since it is larger than the sum of its proper divisors (1921006567).

12026561561 is a wasteful number, since it uses less digits than its factorization.

12026561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16292.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 12026561561 in words is "twelve billion, twenty-six million, five hundred sixty-one thousand, five hundred sixty-one".