25819152517 has 2 divisors, whose sum is σ = 25819152518. Its totient is φ = 25819152516.

The previous prime is 25819152439. The next prime is 25819152571. The reversal of 25819152517 is 71525191852.

It is a happy number.

Together with next prime (25819152571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24636755521 + 1182396996 = 156961^2 + 34386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25819152517 is a prime.

It is a super-2 number, since 2×25819152517² (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 (25819152017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12909576258 + 12909576259.

It is an arithmetic number, because the mean of its divisors is an integer number (12909576259).

Almost surely, 2^25819152517 is an apocalyptic number.

It is an amenable number.

25819152517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25819152517 is an equidigital number, since it uses as much as digits as its factorization.

25819152517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252000, while the sum is 46.

The spelling of 25819152517 in words is "twenty-five billion, eight hundred nineteen million, one hundred fifty-two thousand, five hundred seventeen".