12547533520 has 20 divisors (see below), whose sum is σ = 29173015620. Its totient is φ = 5019013376.

The previous prime is 12547533487. The next prime is 12547533527. The reversal of 12547533520 is 2533574521.

It is a happy number.

12547533520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4102658704 + 8444874816 = 64052^2 + 91896^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 12547533520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12547533527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78422005 + ... + 78422164.

It is an arithmetic number, because the mean of its divisors is an integer number (1458650781).

Almost surely, 2^12547533520 is an apocalyptic number.

12547533520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12547533520 is an abundant number, since it is smaller than the sum of its proper divisors (16625482100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12547533520 is a wasteful number, since it uses less digits than its factorization.

12547533520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156844182 (or 156844176 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 12547533520 in words is "twelve billion, five hundred forty-seven million, five hundred thirty-three thousand, five hundred twenty".