25428043609 has 2 divisors, whose sum is σ = 25428043610. Its totient is φ = 25428043608.

The previous prime is 25428043591. The next prime is 25428043631. The reversal of 25428043609 is 90634082452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25162842384 + 265201225 = 158628^2 + 16285^2 .

It is a cyclic number.

It is not a de Polignac number, because 25428043609 - 2¹⁵ = 25428010841 is a prime.

It is not a weakly prime, because it can be changed into another prime (25428043009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12714021804 + 12714021805.

It is an arithmetic number, because the mean of its divisors is an integer number (12714021805).

Almost surely, 2^25428043609 is an apocalyptic number.

It is an amenable number.

25428043609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25428043609 is an equidigital number, since it uses as much as digits as its factorization.

25428043609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 25428043609 in words is "twenty-five billion, four hundred twenty-eight million, forty-three thousand, six hundred nine".