12604431261 has 48 divisors (see below), whose sum is σ = 18970536960. Its totient is φ = 7421356800.

The previous prime is 12604431239. The next prime is 12604431353. The reversal of 12604431261 is 16213440621.

It is not a de Polignac number, because 12604431261 - 2⁹ = 12604430749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12604431361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1759036 + ... + 1766186.

It is an arithmetic number, because the mean of its divisors is an integer number (395219520).

Almost surely, 2^12604431261 is an apocalyptic number.

It is an amenable number.

12604431261 is a deficient number, since it is larger than the sum of its proper divisors (6366105699).

12604431261 is a wasteful number, since it uses less digits than its factorization.

12604431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314 (or 7297 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 12604431261 its reverse (16213440621), we get a palindrome (28817871882).

The spelling of 12604431261 in words is "twelve billion, six hundred four million, four hundred thirty-one thousand, two hundred sixty-one".