25612500281 has 2 divisors, whose sum is σ = 25612500282. Its totient is φ = 25612500280.

The previous prime is 25612500259. The next prime is 25612500283. The reversal of 25612500281 is 18200521652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13707726400 + 11904773881 = 117080^2 + 109109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25612500281 is a prime.

It is a super-2 number, since 2×25612500281² (a number of 22 digits) contains 22 as substring.

Together with 25612500283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25612500283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806250140 + 12806250141.

It is an arithmetic number, because the mean of its divisors is an integer number (12806250141).

Almost surely, 2^25612500281 is an apocalyptic number.

It is an amenable number.

25612500281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25612500281 is an equidigital number, since it uses as much as digits as its factorization.

25612500281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 25612500281 in words is "twenty-five billion, six hundred twelve million, five hundred thousand, two hundred eighty-one".