25263391717 has 2 divisors, whose sum is σ = 25263391718. Its totient is φ = 25263391716.

The previous prime is 25263391663. The next prime is 25263391721. The reversal of 25263391717 is 71719336252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24902733636 + 360658081 = 157806^2 + 18991^2 .

It is a cyclic number.

It is not a de Polignac number, because 25263391717 - 2³¹ = 23115908069 is a prime.

It is a super-2 number, since 2×25263391717² (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 (25263391817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12631695858 + 12631695859.

It is an arithmetic number, because the mean of its divisors is an integer number (12631695859).

Almost surely, 2^25263391717 is an apocalyptic number.

It is an amenable number.

25263391717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25263391717 is an equidigital number, since it uses as much as digits as its factorization.

25263391717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The spelling of 25263391717 in words is "twenty-five billion, two hundred sixty-three million, three hundred ninety-one thousand, seven hundred seventeen".