2605680689 has 2 divisors, whose sum is σ = 2605680690. Its totient is φ = 2605680688.

The previous prime is 2605680683. The next prime is 2605680703. The reversal of 2605680689 is 9860865062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2119037089 + 486643600 = 46033^2 + 22060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605680689 - 2¹⁶ = 2605615153 is a prime.

It is not a weakly prime, because it can be changed into another prime (2605680683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302840344 + 1302840345.

It is an arithmetic number, because the mean of its divisors is an integer number (1302840345).

Almost surely, 2^2605680689 is an apocalyptic number.

It is an amenable number.

2605680689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605680689 is an equidigital number, since it uses as much as digits as its factorization.

2605680689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 2605680689 is about 51045.8684812003. The cubic root of 2605680689 is about 1376.0695922711.

The spelling of 2605680689 in words is "two billion, six hundred five million, six hundred eighty thousand, six hundred eighty-nine".