25717731271 has 2 divisors, whose sum is σ = 25717731272. Its totient is φ = 25717731270.

The previous prime is 25717731209. The next prime is 25717731283. The reversal of 25717731271 is 17213771752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25717731271 - 2¹¹ = 25717729223 is a prime.

It is a super-2 number, since 2×25717731271² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25717731671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12858865635 + 12858865636.

It is an arithmetic number, because the mean of its divisors is an integer number (12858865636).

Almost surely, 2^25717731271 is an apocalyptic number.

25717731271 is a deficient number, since it is larger than the sum of its proper divisors (1).

25717731271 is an equidigital number, since it uses as much as digits as its factorization.

25717731271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144060, while the sum is 43.

The spelling of 25717731271 in words is "twenty-five billion, seven hundred seventeen million, seven hundred thirty-one thousand, two hundred seventy-one".