25920368849 has 2 divisors, whose sum is σ = 25920368850. Its totient is φ = 25920368848.

The previous prime is 25920368827. The next prime is 25920368863. The reversal of 25920368849 is 94886302952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19888050625 + 6032318224 = 141025^2 + 77668^2 .

It is a cyclic number.

It is not a de Polignac number, because 25920368849 - 2²⁸ = 25651933393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25920368794 and 25920368803.

It is not a weakly prime, because it can be changed into another prime (25920328849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960184424 + 12960184425.

It is an arithmetic number, because the mean of its divisors is an integer number (12960184425).

Almost surely, 2^25920368849 is an apocalyptic number.

It is an amenable number.

25920368849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25920368849 is an equidigital number, since it uses as much as digits as its factorization.

25920368849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 25920368849 in words is "twenty-five billion, nine hundred twenty million, three hundred sixty-eight thousand, eight hundred forty-nine".