12866512587 has 16 divisors (see below), whose sum is σ = 18089934720. Its totient is φ = 8111966400.

The previous prime is 12866512537. The next prime is 12866512609. The reversal of 12866512587 is 78521566821.

It is not a de Polignac number, because 12866512587 - 2¹⁶ = 12866447051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12866512537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165114 + ... + 230207.

It is an arithmetic number, because the mean of its divisors is an integer number (1130620920).

Almost surely, 2^12866512587 is an apocalyptic number.

12866512587 is a deficient number, since it is larger than the sum of its proper divisors (5223422133).

12866512587 is a wasteful number, since it uses less digits than its factorization.

12866512587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395914.

The product of its digits is 1612800, while the sum is 51.

The spelling of 12866512587 in words is "twelve billion, eight hundred sixty-six million, five hundred twelve thousand, five hundred eighty-seven".