25709617873 has 2 divisors, whose sum is σ = 25709617874. Its totient is φ = 25709617872.

The previous prime is 25709617861. The next prime is 25709617883. The reversal of 25709617873 is 37871690752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18458754769 + 7250863104 = 135863^2 + 85152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25709617873 is a prime.

It is not a weakly prime, because it can be changed into another prime (25709617883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854808936 + 12854808937.

It is an arithmetic number, because the mean of its divisors is an integer number (12854808937).

Almost surely, 2^25709617873 is an apocalyptic number.

It is an amenable number.

25709617873 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709617873 is an equidigital number, since it uses as much as digits as its factorization.

25709617873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 25709617873 in words is "twenty-five billion, seven hundred nine million, six hundred seventeen thousand, eight hundred seventy-three".