25808268049 has 2 divisors, whose sum is σ = 25808268050. Its totient is φ = 25808268048.

The previous prime is 25808268047. The next prime is 25808268071. The reversal of 25808268049 is 94086280852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13957768449 + 11850499600 = 118143^2 + 108860^2 .

It is a cyclic number.

It is not a de Polignac number, because 25808268049 - 2¹ = 25808268047 is a prime.

Together with 25808268047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25808267987 and 25808268005.

It is not a weakly prime, because it can be changed into another prime (25808268047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12904134024 + 12904134025.

It is an arithmetic number, because the mean of its divisors is an integer number (12904134025).

Almost surely, 2^25808268049 is an apocalyptic number.

It is an amenable number.

25808268049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25808268049 is an equidigital number, since it uses as much as digits as its factorization.

25808268049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 52.

The spelling of 25808268049 in words is "twenty-five billion, eight hundred eight million, two hundred sixty-eight thousand, forty-nine".