12555956489 has 2 divisors, whose sum is σ = 12555956490. Its totient is φ = 12555956488.

The previous prime is 12555956471. The next prime is 12555956627. The reversal of 12555956489 is 98465955521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10084176400 + 2471780089 = 100420^2 + 49717^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555956489 - 2¹² = 12555952393 is a prime.

It is a super-4 number, since 4×12555956489⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (12555956089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277978244 + 6277978245.

It is an arithmetic number, because the mean of its divisors is an integer number (6277978245).

Almost surely, 2^12555956489 is an apocalyptic number.

It is an amenable number.

12555956489 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555956489 is an equidigital number, since it uses as much as digits as its factorization.

12555956489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440000, while the sum is 59.

The spelling of 12555956489 in words is "twelve billion, five hundred fifty-five million, nine hundred fifty-six thousand, four hundred eighty-nine".