12816590681 has 4 divisors (see below), whose sum is σ = 12819139200. Its totient is φ = 12814042164.

The previous prime is 12816590659. The next prime is 12816590701. The reversal of 12816590681 is 18609561821.

It is a happy number.

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 12816590681 - 2¹⁰ = 12816589657 is a prime.

It is a super-3 number, since 3×12816590681³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12816590641) 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 3 ways as a sum of consecutive naturals, for example, 1266701 + ... + 1276778.

It is an arithmetic number, because the mean of its divisors is an integer number (3204784800).

Almost surely, 2^12816590681 is an apocalyptic number.

It is an amenable number.

12816590681 is a deficient number, since it is larger than the sum of its proper divisors (2548519).

12816590681 is an equidigital number, since it uses as much as digits as its factorization.

12816590681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548518.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 12816590681 in words is "twelve billion, eight hundred sixteen million, five hundred ninety thousand, six hundred eighty-one".