12566260261 has 4 divisors (see below), whose sum is σ = 13227642400. Its totient is φ = 11904878124.

The previous prime is 12566260249. The next prime is 12566260297. The reversal of 12566260261 is 16206266521.

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 not a de Polignac number, because 12566260261 - 2⁹ = 12566259749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12566260261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566260211) 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, 330691041 + ... + 330691078.

It is an arithmetic number, because the mean of its divisors is an integer number (3306910600).

Almost surely, 2^12566260261 is an apocalyptic number.

It is an amenable number.

12566260261 is a deficient number, since it is larger than the sum of its proper divisors (661382139).

12566260261 is an equidigital number, since it uses as much as digits as its factorization.

12566260261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661382138.

The product of its (nonzero) digits is 51840, while the sum is 37.

It can be divided in two parts, 12566260 and 261, that added together give a palindrome (12566521).

The spelling of 12566260261 in words is "twelve billion, five hundred sixty-six million, two hundred sixty thousand, two hundred sixty-one".