25675213649 has 2 divisors, whose sum is σ = 25675213650. Its totient is φ = 25675213648.

The previous prime is 25675213639. The next prime is 25675213661. The reversal of 25675213649 is 94631257652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25657632400 + 17581249 = 160180^2 + 4193^2 .

It is a cyclic number.

It is not a de Polignac number, because 25675213649 - 2²⁸ = 25406778193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25675213597 and 25675213606.

It is not a weakly prime, because it can be changed into another prime (25675213639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12837606824 + 12837606825.

It is an arithmetic number, because the mean of its divisors is an integer number (12837606825).

Almost surely, 2^25675213649 is an apocalyptic number.

It is an amenable number.

25675213649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25675213649 is an equidigital number, since it uses as much as digits as its factorization.

25675213649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 50.

The spelling of 25675213649 in words is "twenty-five billion, six hundred seventy-five million, two hundred thirteen thousand, six hundred forty-nine".