12815138587 has 8 divisors (see below), whose sum is σ = 12889800000. Its totient is φ = 12740511624.

The previous prime is 12815138573. The next prime is 12815138591. The reversal of 12815138587 is 78583151821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12815138587 - 2¹¹ = 12815136539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12815138587.

It is not an unprimeable number, because it can be changed into a prime (12815138507) 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, 1337548 + ... + 1347094.

It is an arithmetic number, because the mean of its divisors is an integer number (1611225000).

Almost surely, 2^12815138587 is an apocalyptic number.

12815138587 is a deficient number, since it is larger than the sum of its proper divisors (74661413).

12815138587 is an equidigital number, since it uses as much as digits as its factorization.

12815138587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17225.

The product of its digits is 537600, while the sum is 49.

The spelling of 12815138587 in words is "twelve billion, eight hundred fifteen million, one hundred thirty-eight thousand, five hundred eighty-seven".