25853567449 has 2 divisors, whose sum is σ = 25853567450. Its totient is φ = 25853567448.

The previous prime is 25853567437. The next prime is 25853567471. The reversal of 25853567449 is 94476535852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15038607424 + 10814960025 = 122632^2 + 103995^2 .

It is a cyclic number.

It is not a de Polignac number, because 25853567449 - 2⁵ = 25853567417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25853567393 and 25853567402.

It is not a weakly prime, because it can be changed into another prime (25853567249) 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, 12926783724 + 12926783725.

It is an arithmetic number, because the mean of its divisors is an integer number (12926783725).

Almost surely, 2^25853567449 is an apocalyptic number.

It is an amenable number.

25853567449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25853567449 is an equidigital number, since it uses as much as digits as its factorization.

25853567449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288000, while the sum is 58.

The spelling of 25853567449 in words is "twenty-five billion, eight hundred fifty-three million, five hundred sixty-seven thousand, four hundred forty-nine".