12357871515 has 80 divisors (see below), whose sum is σ = 24330002400. Its totient is φ = 5951162880.

The previous prime is 12357871447. The next prime is 12357871517. The reversal of 12357871515 is 51517875321.

12357871515 is a `hidden beast` number, since 1 + 2 + 3 + 57 + 87 + 1 + 515 = 666.

12357871515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12357871515 - 2⁹ = 12357871003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (12357871517) 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 79 ways as a sum of consecutive naturals, for example, 654487 + ... + 673103.

It is an arithmetic number, because the mean of its divisors is an integer number (304125030).

Almost surely, 2^12357871515 is an apocalyptic number.

12357871515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12357871515 is a deficient number, since it is larger than the sum of its proper divisors (11972130885).

12357871515 is a wasteful number, since it uses less digits than its factorization.

12357871515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18794 (or 18785 counting only the distinct ones).

The product of its digits is 294000, while the sum is 45.

The spelling of 12357871515 in words is "twelve billion, three hundred fifty-seven million, eight hundred seventy-one thousand, five hundred fifteen".