25321816805 has 16 divisors (see below), whose sum is σ = 30455590464. Its totient is φ = 20211233280.

The previous prime is 25321816789. The next prime is 25321816841. The reversal of 25321816805 is 50861812352.

It is not a de Polignac number, because 25321816805 - 2⁴ = 25321816789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6011150 + ... + 6015360.

It is an arithmetic number, because the mean of its divisors is an integer number (1903474404).

Almost surely, 2^25321816805 is an apocalyptic number.

It is an amenable number.

25321816805 is a deficient number, since it is larger than the sum of its proper divisors (5133773659).

25321816805 is a wasteful number, since it uses less digits than its factorization.

25321816805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676.

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 25321816805 in words is "twenty-five billion, three hundred twenty-one million, eight hundred sixteen thousand, eight hundred five".