25854643489 has 2 divisors, whose sum is σ = 25854643490. Its totient is φ = 25854643488.

The previous prime is 25854643487. The next prime is 25854643517. The reversal of 25854643489 is 98434645852.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25188229264 + 666414225 = 158708^2 + 25815^2 .

It is a cyclic number.

It is not a de Polignac number, because 25854643489 - 2¹ = 25854643487 is a prime.

Together with 25854643487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25854643483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927321744 + 12927321745.

It is an arithmetic number, because the mean of its divisors is an integer number (12927321745).

Almost surely, 2^25854643489 is an apocalyptic number.

It is an amenable number.

25854643489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25854643489 is an equidigital number, since it uses as much as digits as its factorization.

25854643489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33177600, while the sum is 58.

The spelling of 25854643489 in words is "twenty-five billion, eight hundred fifty-four million, six hundred forty-three thousand, four hundred eighty-nine".