25861877909 has 16 divisors (see below), whose sum is σ = 29775785088. Its totient is φ = 22003106112.

The previous prime is 25861877891. The next prime is 25861877917. The reversal of 25861877909 is 90977816852.

It is a cyclic number.

It is not a de Polignac number, because 25861877909 - 2¹⁶ = 25861812373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861877609) by changing a digit.

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, 1083902 + ... + 1107504.

It is an arithmetic number, because the mean of its divisors is an integer number (1860986568).

Almost surely, 2^25861877909 is an apocalyptic number.

It is an amenable number.

25861877909 is a deficient number, since it is larger than the sum of its proper divisors (3913907179).

25861877909 is a wasteful number, since it uses less digits than its factorization.

25861877909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 25861877909 in words is "twenty-five billion, eight hundred sixty-one million, eight hundred seventy-seven thousand, nine hundred nine".