25681818713 has 2 divisors, whose sum is σ = 25681818714. Its totient is φ = 25681818712.

The previous prime is 25681818641. The next prime is 25681818751. The reversal of 25681818713 is 31781818652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19967668249 + 5714150464 = 141307^2 + 75592^2 .

It is a cyclic number.

It is not a de Polignac number, because 25681818713 - 2⁸ = 25681818457 is a prime.

It is not a weakly prime, because it can be changed into another prime (25681818013) 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, 12840909356 + 12840909357.

It is an arithmetic number, because the mean of its divisors is an integer number (12840909357).

Almost surely, 2^25681818713 is an apocalyptic number.

It is an amenable number.

25681818713 is a deficient number, since it is larger than the sum of its proper divisors (1).

25681818713 is an equidigital number, since it uses as much as digits as its factorization.

25681818713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

It can be divided in two parts, 2568 and 1818713, that added together give a palindrome (1821281).

The spelling of 25681818713 in words is "twenty-five billion, six hundred eighty-one million, eight hundred eighteen thousand, seven hundred thirteen".