25840665859 has 2 divisors, whose sum is σ = 25840665860. Its totient is φ = 25840665858.

The previous prime is 25840665857. The next prime is 25840665943. The reversal of 25840665859 is 95856604852.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25840665859 - 2¹ = 25840665857 is a prime.

Together with 25840665857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25840665857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12920332929 + 12920332930.

It is an arithmetic number, because the mean of its divisors is an integer number (12920332930).

Almost surely, 2^25840665859 is an apocalyptic number.

25840665859 is a deficient number, since it is larger than the sum of its proper divisors (1).

25840665859 is an equidigital number, since it uses as much as digits as its factorization.

25840665859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736000, while the sum is 58.

The spelling of 25840665859 in words is "twenty-five billion, eight hundred forty million, six hundred sixty-five thousand, eight hundred fifty-nine".