25897292209 has 2 divisors, whose sum is σ = 25897292210. Its totient is φ = 25897292208.

The previous prime is 25897292207. The next prime is 25897292299. The reversal of 25897292209 is 90229279852.

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., 25737143184 + 160149025 = 160428^2 + 12655^2 .

It is a cyclic number.

It is not a de Polignac number, because 25897292209 - 2¹ = 25897292207 is a prime.

Together with 25897292207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25897292209.

It is not a weakly prime, because it can be changed into another prime (25897292207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12948646104 + 12948646105.

It is an arithmetic number, because the mean of its divisors is an integer number (12948646105).

Almost surely, 2^25897292209 is an apocalyptic number.

It is an amenable number.

25897292209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25897292209 is an equidigital number, since it uses as much as digits as its factorization.

25897292209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 25897292209 in words is "twenty-five billion, eight hundred ninety-seven million, two hundred ninety-two thousand, two hundred nine".