12515818220538 has 16 divisors (see below), whose sum is σ = 25034061876096. Its totient is φ = 4171535167680.

The previous prime is 12515818220533. The next prime is 12515818220551. The reversal of 12515818220538 is 83502281851521.

It is a happy number.

12515818220538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12515818220533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100992706 + ... + 101116557.

It is an arithmetic number, because the mean of its divisors is an integer number (1564628867256).

Almost surely, 2^{12515818220538} is an apocalyptic number.

12515818220538 is an abundant number, since it is smaller than the sum of its proper divisors (12518243655558).

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

12515818220538 is a wasteful number, since it uses less digits than its factorization.

12515818220538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202119589.

The product of its (nonzero) digits is 1536000, while the sum is 51.

The spelling of 12515818220538 in words is "twelve trillion, five hundred fifteen billion, eight hundred eighteen million, two hundred twenty thousand, five hundred thirty-eight".