12681812813 has 8 divisors (see below), whose sum is σ = 13431184632. Its totient is φ = 11932816896.

The previous prime is 12681812807. The next prime is 12681812837. The reversal of 12681812813 is 31821818621.

It can be written as a sum of positive squares in 4 ways, for example, as 6842102089 + 5839710724 = 82717^2 + 76418^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12681812813 - 2⁸ = 12681812557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681812873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22970 + ... + 160907.

It is an arithmetic number, because the mean of its divisors is an integer number (1678898079).

Almost surely, 2^12681812813 is an apocalyptic number.

It is an amenable number.

12681812813 is a deficient number, since it is larger than the sum of its proper divisors (749371819).

12681812813 is a wasteful number, since it uses less digits than its factorization.

12681812813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187951.

The product of its digits is 36864, while the sum is 41.

The spelling of 12681812813 in words is "twelve billion, six hundred eighty-one million, eight hundred twelve thousand, eight hundred thirteen".