25616257 has 2 divisors, whose sum is σ = 25616258. Its totient is φ = 25616256.

The previous prime is 25616249. The next prime is 25616287. The reversal of 25616257 is 75261652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24364096 + 1252161 = 4936^2 + 1119^2 .

It is a cyclic number.

It is not a de Polignac number, because 25616257 - 2³ = 25616249 is a prime.

It is not a weakly prime, because it can be changed into another prime (25616287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12808128 + 12808129.

It is an arithmetic number, because the mean of its divisors is an integer number (12808129).

Almost surely, 2^25616257 is an apocalyptic number.

It is an amenable number.

25616257 is a deficient number, since it is larger than the sum of its proper divisors (1).

25616257 is an equidigital number, since it uses as much as digits as its factorization.

25616257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 25616257 is about 5061.2505371696. The cubic root of 25616257 is about 294.7848934608.

The spelling of 25616257 in words is "twenty-five million, six hundred sixteen thousand, two hundred fifty-seven".