25840403863 has 4 divisors (see below), whose sum is σ = 25875371320. Its totient is φ = 25805436408.

The previous prime is 25840403851. The next prime is 25840403867. The reversal of 25840403863 is 36830404852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25840403863 - 2¹⁷ = 25840272791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25840403867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17482620 + ... + 17484097.

It is an arithmetic number, because the mean of its divisors is an integer number (6468842830).

Almost surely, 2^25840403863 is an apocalyptic number.

25840403863 is a deficient number, since it is larger than the sum of its proper divisors (34967457).

25840403863 is an equidigital number, since it uses as much as digits as its factorization.

25840403863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34967456.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 25840403863 in words is "twenty-five billion, eight hundred forty million, four hundred three thousand, eight hundred sixty-three".