12805663 has 16 divisors (see below), whose sum is σ = 14385280. Its totient is φ = 11321856.

The previous prime is 12805627. The next prime is 12805673. The reversal of 12805663 is 36650821.

12805663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12805663 - 2¹³ = 12797471 is a prime.

It is the 3579-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805603) by changing a digit.

It is a nontrivial repunit in base 3578.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37831 + ... + 38167.

It is an arithmetic number, because the mean of its divisors is an integer number (899080).

Almost surely, 2^12805663 is an apocalyptic number.

12805663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12805663 is a deficient number, since it is larger than the sum of its proper divisors (1579617).

12805663 is a wasteful number, since it uses less digits than its factorization.

12805663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 12805663 is about 3578.5001047925. The cubic root of 12805663 is about 233.9559112884.

The spelling of 12805663 in words is "twelve million, eight hundred five thousand, six hundred sixty-three".