25340978017 has 2 divisors, whose sum is σ = 25340978018. Its totient is φ = 25340978016.

The previous prime is 25340978011. The next prime is 25340978057. The reversal of 25340978017 is 71087904352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24523246801 + 817731216 = 156599^2 + 28596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25340978017 is a prime.

It is not a weakly prime, because it can be changed into another prime (25340978011) 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, 12670489008 + 12670489009.

It is an arithmetic number, because the mean of its divisors is an integer number (12670489009).

Almost surely, 2^25340978017 is an apocalyptic number.

It is an amenable number.

25340978017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25340978017 is an equidigital number, since it uses as much as digits as its factorization.

25340978017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 25340978017 in words is "twenty-five billion, three hundred forty million, nine hundred seventy-eight thousand, seventeen".