25840403851 has 2 divisors, whose sum is σ = 25840403852. Its totient is φ = 25840403850.

The previous prime is 25840403843. The next prime is 25840403867. The reversal of 25840403851 is 15830404852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25840403851 - 2³ = 25840403843 is a prime.

It is not a weakly prime, because it can be changed into another prime (25840403891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12920201925 + 12920201926.

It is an arithmetic number, because the mean of its divisors is an integer number (12920201926).

Almost surely, 2^25840403851 is an apocalyptic number.

25840403851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25840403851 is an equidigital number, since it uses as much as digits as its factorization.

25840403851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 25840403851 in words is "twenty-five billion, eight hundred forty million, four hundred three thousand, eight hundred fifty-one".