25662623489 has 2 divisors, whose sum is σ = 25662623490. Its totient is φ = 25662623488.

The previous prime is 25662623443. The next prime is 25662623491. The reversal of 25662623489 is 98432626652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18575509264 + 7087114225 = 136292^2 + 84185^2 .

It is a cyclic number.

It is not a de Polignac number, because 25662623489 - 2¹² = 25662619393 is a prime.

Together with 25662623491, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25662623489.

It is not a weakly prime, because it can be changed into another prime (25662623419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831311744 + 12831311745.

It is an arithmetic number, because the mean of its divisors is an integer number (12831311745).

Almost surely, 2^25662623489 is an apocalyptic number.

It is an amenable number.

25662623489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25662623489 is an equidigital number, since it uses as much as digits as its factorization.

25662623489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 53.

The spelling of 25662623489 in words is "twenty-five billion, six hundred sixty-two million, six hundred twenty-three thousand, four hundred eighty-nine".