2681664889 has 4 divisors (see below), whose sum is σ = 2768170240. Its totient is φ = 2595159540.

The previous prime is 2681664863. The next prime is 2681664917. The reversal of 2681664889 is 9884661862.

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 2681664889 - 2²⁵ = 2648110457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681664809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43252629 + ... + 43252690.

It is an arithmetic number, because the mean of its divisors is an integer number (692042560).

Almost surely, 2^2681664889 is an apocalyptic number.

It is an amenable number.

2681664889 is a deficient number, since it is larger than the sum of its proper divisors (86505351).

2681664889 is an equidigital number, since it uses as much as digits as its factorization.

2681664889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86505350.

The product of its digits is 7962624, while the sum is 58.

The square root of 2681664889 is about 51784.7939939902. The cubic root of 2681664889 is about 1389.3174864705.

The spelling of 2681664889 in words is "two billion, six hundred eighty-one million, six hundred sixty-four thousand, eight hundred eighty-nine".