12587866878521 has 4 divisors (see below), whose sum is σ = 13732218412944. Its totient is φ = 11443515344100.

The previous prime is 12587866878463. The next prime is 12587866878527.

12587866878521 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12587866878521 - 2¹⁰ = 12587866877497 is a prime.

It is a super-2 number, since 2×12587866878521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12587866878527) 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, 572175767195 + ... + 572175767216.

It is an arithmetic number, because the mean of its divisors is an integer number (3433054603236).

Almost surely, 2^{12587866878521} is an apocalyptic number.

12587866878521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12587866878521 is a deficient number, since it is larger than the sum of its proper divisors (1144351534423).

12587866878521 is a wasteful number, since it uses less digits than its factorization.

12587866878521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144351534422.

The product of its digits is 722534400, while the sum is 74.

The spelling of 12587866878521 in words is "twelve trillion, five hundred eighty-seven billion, eight hundred sixty-six million, eight hundred seventy-eight thousand, five hundred twenty-one".