12844520505 has 24 divisors (see below), whose sum is σ = 23435617920. Its totient is φ = 6489862560.

The previous prime is 12844520431. The next prime is 12844520509. The reversal of 12844520505 is 50502544821.

12844520505 is a `hidden beast` number, since 1 + 2 + 8 + 445 + 205 + 0 + 5 = 666.

It is not a de Polignac number, because 12844520505 - 2¹⁰ = 12844519481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12844520505.

It is not an unprimeable number, because it can be changed into a prime (12844520509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7510561 + ... + 7512270.

It is an arithmetic number, because the mean of its divisors is an integer number (976484080).

Almost surely, 2^12844520505 is an apocalyptic number.

12844520505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12844520505 is a deficient number, since it is larger than the sum of its proper divisors (10591097415).

12844520505 is a wasteful number, since it uses less digits than its factorization.

12844520505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15022861 (or 15022858 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The spelling of 12844520505 in words is "twelve billion, eight hundred forty-four million, five hundred twenty thousand, five hundred five".