25257357109 has 2 divisors, whose sum is σ = 25257357110. Its totient is φ = 25257357108.

The previous prime is 25257357107. The next prime is 25257357131. The reversal of 25257357109 is 90175375252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22207556484 + 3049800625 = 149022^2 + 55225^2 .

It is a cyclic number.

It is not a de Polignac number, because 25257357109 - 2¹ = 25257357107 is a prime.

Together with 25257357107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25257357107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628678554 + 12628678555.

It is an arithmetic number, because the mean of its divisors is an integer number (12628678555).

Almost surely, 2^25257357109 is an apocalyptic number.

It is an amenable number.

25257357109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25257357109 is an equidigital number, since it uses as much as digits as its factorization.

25257357109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 661500, while the sum is 46.

The spelling of 25257357109 in words is "twenty-five billion, two hundred fifty-seven million, three hundred fifty-seven thousand, one hundred nine".