12555449999 has 4 divisors (see below), whose sum is σ = 12792345336. Its totient is φ = 12318554664.

The previous prime is 12555449941. The next prime is 12555450007. The reversal of 12555449999 is 99994455521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99994455521 = 1913 ⋅52271017.

It is a cyclic number.

It is not a de Polignac number, because 12555449999 - 2²⁸ = 12287014543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12555449939) 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, 118447589 + ... + 118447694.

It is an arithmetic number, because the mean of its divisors is an integer number (3198086334).

Almost surely, 2^12555449999 is an apocalyptic number.

12555449999 is a deficient number, since it is larger than the sum of its proper divisors (236895337).

12555449999 is an equidigital number, since it uses as much as digits as its factorization.

12555449999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236895336.

The product of its digits is 26244000, while the sum is 62.

The spelling of 12555449999 in words is "twelve billion, five hundred fifty-five million, four hundred forty-nine thousand, nine hundred ninety-nine".