25518509087 has 2 divisors, whose sum is σ = 25518509088. Its totient is φ = 25518509086.

The previous prime is 25518509083. The next prime is 25518509129. The reversal of 25518509087 is 78090581552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25518509087 - 2² = 25518509083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25518509083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759254543 + 12759254544.

It is an arithmetic number, because the mean of its divisors is an integer number (12759254544).

Almost surely, 2^25518509087 is an apocalyptic number.

25518509087 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518509087 is an equidigital number, since it uses as much as digits as its factorization.

25518509087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008000, while the sum is 50.

The spelling of 25518509087 in words is "twenty-five billion, five hundred eighteen million, five hundred nine thousand, eighty-seven".