12811601689 has 8 divisors (see below), whose sum is σ = 13019845640. Its totient is φ = 12604242816.

The previous prime is 12811601687. The next prime is 12811601707. The reversal of 12811601689 is 98610611821.

It can be written as a sum of positive squares in 4 ways, for example, as 6987622464 + 5823979225 = 83592^2 + 76315^2 .

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 12811601689 - 2¹ = 12811601687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12811601683) 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, 192054 + ... + 250015.

It is an arithmetic number, because the mean of its divisors is an integer number (1627480705).

Almost surely, 2^12811601689 is an apocalyptic number.

It is an amenable number.

12811601689 is a deficient number, since it is larger than the sum of its proper divisors (208243951).

12811601689 is an equidigital number, since it uses as much as digits as its factorization.

12811601689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442539.

The product of its (nonzero) digits is 41472, while the sum is 43.

The spelling of 12811601689 in words is "twelve billion, eight hundred eleven million, six hundred one thousand, six hundred eighty-nine".