12516243587 has 4 divisors (see below), whose sum is σ = 12516467880. Its totient is φ = 12516019296.

The previous prime is 12516243529. The next prime is 12516243611. The reversal of 12516243587 is 78534261521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12516243587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12516243527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44408 + ... + 164330.

It is an arithmetic number, because the mean of its divisors is an integer number (3129116970).

Almost surely, 2^12516243587 is an apocalyptic number.

12516243587 is a deficient number, since it is larger than the sum of its proper divisors (224293).

12516243587 is a wasteful number, since it uses less digits than its factorization.

12516243587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224292.

The product of its digits is 403200, while the sum is 44.

The spelling of 12516243587 in words is "twelve billion, five hundred sixteen million, two hundred forty-three thousand, five hundred eighty-seven".