12534240205 has 4 divisors (see below), whose sum is σ = 15041088252. Its totient is φ = 10027392160.

The previous prime is 12534240179. The next prime is 12534240209. The reversal of 12534240205 is 50204243521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50204243521 = 43 ⋅1167540547.

It can be written as a sum of positive squares in 2 ways, for example, as 6546266281 + 5987973924 = 80909^2 + 77382^2 .

It is not a de Polignac number, because 12534240205 - 2³¹ = 10386756557 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 (12534240209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253424016 + ... + 1253424025.

It is an arithmetic number, because the mean of its divisors is an integer number (3760272063).

Almost surely, 2^12534240205 is an apocalyptic number.

It is an amenable number.

12534240205 is a deficient number, since it is larger than the sum of its proper divisors (2506848047).

12534240205 is an equidigital number, since it uses as much as digits as its factorization.

12534240205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506848046.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 12534240205 its reverse (50204243521), we get a palindrome (62738483726).

The spelling of 12534240205 in words is "twelve billion, five hundred thirty-four million, two hundred forty thousand, two hundred five".