25252505521 has 2 divisors, whose sum is σ = 25252505522. Its totient is φ = 25252505520.

The previous prime is 25252505471. The next prime is 25252505549. The reversal of 25252505521 is 12550525252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22372680625 + 2879824896 = 149575^2 + 53664^2 .

It is a cyclic number.

It is not a de Polignac number, because 25252505521 - 2²³ = 25244116913 is a prime.

It is not a weakly prime, because it can be changed into another prime (25252505021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12626252760 + 12626252761.

It is an arithmetic number, because the mean of its divisors is an integer number (12626252761).

Almost surely, 2^25252505521 is an apocalyptic number.

It is an amenable number.

25252505521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25252505521 is an equidigital number, since it uses as much as digits as its factorization.

25252505521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50000, while the sum is 34.

The spelling of 25252505521 in words is "twenty-five billion, two hundred fifty-two million, five hundred five thousand, five hundred twenty-one".