12560555369 has 18 divisors (see below), whose sum is σ = 13468362558. Its totient is φ = 11706006400.

The previous prime is 12560555339. The next prime is 12560555393. The reversal of 12560555369 is 96355506521.

It can be written as a sum of positive squares in 3 ways, for example, as 4281739225 + 8278816144 = 65435^2 + 90988^2 .

It is not a de Polignac number, because 12560555369 - 2⁸ = 12560555113 is a prime.

It is a super-2 number, since 2×12560555369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12560555339) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16504949 + ... + 16505709.

Almost surely, 2^12560555369 is an apocalyptic number.

It is an amenable number.

12560555369 is a deficient number, since it is larger than the sum of its proper divisors (907807189).

12560555369 is an frugal number, since it uses more digits than its factorization.

12560555369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 1215000, while the sum is 47.

The spelling of 12560555369 in words is "twelve billion, five hundred sixty million, five hundred fifty-five thousand, three hundred sixty-nine".