25520025121 has 2 divisors, whose sum is σ = 25520025122. Its totient is φ = 25520025120.

The previous prime is 25520025109. The next prime is 25520025137. The reversal of 25520025121 is 12152002552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13355038096 + 12164987025 = 115564^2 + 110295^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520025121 - 2⁷ = 25520024993 is a prime.

It is not a weakly prime, because it can be changed into another prime (25520025191) 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, 12760012560 + 12760012561.

It is an arithmetic number, because the mean of its divisors is an integer number (12760012561).

Almost surely, 2^25520025121 is an apocalyptic number.

It is an amenable number.

25520025121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520025121 is an equidigital number, since it uses as much as digits as its factorization.

25520025121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 25520025121 its reverse (12152002552), we get a palindrome (37672027673).

The spelling of 25520025121 in words is "twenty-five billion, five hundred twenty million, twenty-five thousand, one hundred twenty-one".