25116362521 has 2 divisors, whose sum is σ = 25116362522. Its totient is φ = 25116362520.

The previous prime is 25116362519. The next prime is 25116362539. The reversal of 25116362521 is 12526361152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24817591296 + 298771225 = 157536^2 + 17285^2 .

It is a cyclic number.

It is not a de Polignac number, because 25116362521 - 2¹ = 25116362519 is a prime.

Together with 25116362519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25116362501) 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, 12558181260 + 12558181261.

It is an arithmetic number, because the mean of its divisors is an integer number (12558181261).

Almost surely, 2^25116362521 is an apocalyptic number.

It is an amenable number.

25116362521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25116362521 is an equidigital number, since it uses as much as digits as its factorization.

25116362521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The spelling of 25116362521 in words is "twenty-five billion, one hundred sixteen million, three hundred sixty-two thousand, five hundred twenty-one".