25256608717 has 2 divisors, whose sum is σ = 25256608718. Its totient is φ = 25256608716.

The previous prime is 25256608681. The next prime is 25256608723. The reversal of 25256608717 is 71780665252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23978832201 + 1277776516 = 154851^2 + 35746^2 .

It is a cyclic number.

It is not a de Polignac number, because 25256608717 - 2⁷ = 25256608589 is a prime.

It is a super-3 number, since 3×25256608717³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25256608757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628304358 + 12628304359.

It is an arithmetic number, because the mean of its divisors is an integer number (12628304359).

Almost surely, 2^25256608717 is an apocalyptic number.

It is an amenable number.

25256608717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256608717 is an equidigital number, since it uses as much as digits as its factorization.

25256608717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 25256608717 in words is "twenty-five billion, two hundred fifty-six million, six hundred eight thousand, seven hundred seventeen".