25865965193 has 2 divisors, whose sum is σ = 25865965194. Its totient is φ = 25865965192.

The previous prime is 25865965183. The next prime is 25865965219. The reversal of 25865965193 is 39156956852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15224598544 + 10641366649 = 123388^2 + 103157^2 .

It is a cyclic number.

It is not a de Polignac number, because 25865965193 - 2¹⁴ = 25865948809 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 (25865965183) 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, 12932982596 + 12932982597.

It is an arithmetic number, because the mean of its divisors is an integer number (12932982597).

Almost surely, 2^25865965193 is an apocalyptic number.

It is an amenable number.

25865965193 is a deficient number, since it is larger than the sum of its proper divisors (1).

25865965193 is an equidigital number, since it uses as much as digits as its factorization.

25865965193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496000, while the sum is 59.

The spelling of 25865965193 in words is "twenty-five billion, eight hundred sixty-five million, nine hundred sixty-five thousand, one hundred ninety-three".