12544440205 has 32 divisors (see below), whose sum is σ = 17318851200. Its totient is φ = 8626694400.

The previous prime is 12544440197. The next prime is 12544440239. The reversal of 12544440205 is 50204444521.

It is not a de Polignac number, because 12544440205 - 2³ = 12544440197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554251 + ... + 576439.

It is an arithmetic number, because the mean of its divisors is an integer number (541214100).

Almost surely, 2^12544440205 is an apocalyptic number.

It is an amenable number.

12544440205 is a deficient number, since it is larger than the sum of its proper divisors (4774410995).

12544440205 is a wasteful number, since it uses less digits than its factorization.

12544440205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22765.

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 12544440205 its reverse (50204444521), we get a palindrome (62748884726).

It can be divided in two parts, 125444 and 40205, that added together give a square (165649 = 407²).

The spelling of 12544440205 in words is "twelve billion, five hundred forty-four million, four hundred forty thousand, two hundred five".