12887514778685 has 4 divisors (see below), whose sum is σ = 15465017734428. Its totient is φ = 10310011822944.

The previous prime is 12887514778679. The next prime is 12887514778703. The reversal of 12887514778685 is 58687741578821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7236159180121 + 5651355598564 = 2690011^2 + 2377258^2 .

It is a cyclic number.

It is not a de Polignac number, because 12887514778685 - 2²⁰ = 12887513730109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288751477864 + ... + 1288751477873.

It is an arithmetic number, because the mean of its divisors is an integer number (3866254433607).

Almost surely, 2^{12887514778685} is an apocalyptic number.

It is an amenable number.

12887514778685 is a deficient number, since it is larger than the sum of its proper divisors (2577502955743).

12887514778685 is an equidigital number, since it uses as much as digits as its factorization.

12887514778685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577502955742.

The product of its digits is 1685913600, while the sum is 77.

The spelling of 12887514778685 in words is "twelve trillion, eight hundred eighty-seven billion, five hundred fourteen million, seven hundred seventy-eight thousand, six hundred eighty-five".