25511513317 has 2 divisors, whose sum is σ = 25511513318. Its totient is φ = 25511513316.

The previous prime is 25511513309. The next prime is 25511513323. The reversal of 25511513317 is 71331511552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19479505761 + 6032007556 = 139569^2 + 77666^2 .

It is a cyclic number.

It is not a de Polignac number, because 25511513317 - 2³ = 25511513309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25517513317) 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, 12755756658 + 12755756659.

It is an arithmetic number, because the mean of its divisors is an integer number (12755756659).

Almost surely, 2^25511513317 is an apocalyptic number.

It is an amenable number.

25511513317 is a deficient number, since it is larger than the sum of its proper divisors (1).

25511513317 is an equidigital number, since it uses as much as digits as its factorization.

25511513317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15750, while the sum is 34.

The spelling of 25511513317 in words is "twenty-five billion, five hundred eleven million, five hundred thirteen thousand, three hundred seventeen".