12865503665 has 32 divisors (see below), whose sum is σ = 17721006336. Its totient is φ = 8783723520.

The previous prime is 12865503643. The next prime is 12865503671. The reversal of 12865503665 is 56630556821.

12865503665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12865503665 - 2¹⁴ = 12865487281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12453989 + ... + 12455021.

It is an arithmetic number, because the mean of its divisors is an integer number (553781448).

Almost surely, 2^12865503665 is an apocalyptic number.

It is an amenable number.

12865503665 is a deficient number, since it is larger than the sum of its proper divisors (4855502671).

12865503665 is a wasteful number, since it uses less digits than its factorization.

12865503665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 12865503665 in words is "twelve billion, eight hundred sixty-five million, five hundred three thousand, six hundred sixty-five".