25911667949 has 2 divisors, whose sum is σ = 25911667950. Its totient is φ = 25911667948.

The previous prime is 25911667933. The next prime is 25911667961. The reversal of 25911667949 is 94976611952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25203150025 + 708517924 = 158755^2 + 26618^2 .

It is a cyclic number.

It is not a de Polignac number, because 25911667949 - 2⁴ = 25911667933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25911667919) 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, 12955833974 + 12955833975.

It is an arithmetic number, because the mean of its divisors is an integer number (12955833975).

Almost surely, 2^25911667949 is an apocalyptic number.

It is an amenable number.

25911667949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25911667949 is an equidigital number, since it uses as much as digits as its factorization.

25911667949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 59.

The spelling of 25911667949 in words is "twenty-five billion, nine hundred eleven million, six hundred sixty-seven thousand, nine hundred forty-nine".