25640128271 has 2 divisors, whose sum is σ = 25640128272. Its totient is φ = 25640128270.

The previous prime is 25640128247. The next prime is 25640128321. The reversal of 25640128271 is 17282104652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25640128271 - 2⁶ = 25640128207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640128211) 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, 12820064135 + 12820064136.

It is an arithmetic number, because the mean of its divisors is an integer number (12820064136).

Almost surely, 2^25640128271 is an apocalyptic number.

25640128271 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640128271 is an equidigital number, since it uses as much as digits as its factorization.

25640128271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 25640128271 in words is "twenty-five billion, six hundred forty million, one hundred twenty-eight thousand, two hundred seventy-one".