25025356649 has 2 divisors, whose sum is σ = 25025356650. Its totient is φ = 25025356648.

The previous prime is 25025356637. The next prime is 25025356717. The reversal of 25025356649 is 94665352052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24304810000 + 720546649 = 155900^2 + 26843^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025356649 - 2⁸ = 25025356393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25025356049) 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, 12512678324 + 12512678325.

It is an arithmetic number, because the mean of its divisors is an integer number (12512678325).

Almost surely, 2^25025356649 is an apocalyptic number.

It is an amenable number.

25025356649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25025356649 is an equidigital number, since it uses as much as digits as its factorization.

25025356649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 25025356649 in words is "twenty-five billion, twenty-five million, three hundred fifty-six thousand, six hundred forty-nine".