25561768685 has 16 divisors (see below), whose sum is σ = 30732514176. Its totient is φ = 20410532928.

The previous prime is 25561768679. The next prime is 25561768699. The reversal of 25561768685 is 58686716552.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25561768685 - 2¹⁰ = 25561767661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8079914 + ... + 8083076.

It is an arithmetic number, because the mean of its divisors is an integer number (1920782136).

Almost surely, 2^25561768685 is an apocalyptic number.

It is an amenable number.

25561768685 is a deficient number, since it is larger than the sum of its proper divisors (5170745491).

25561768685 is a wasteful number, since it uses less digits than its factorization.

25561768685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732.

The product of its digits is 24192000, while the sum is 59.

The spelling of 25561768685 in words is "twenty-five billion, five hundred sixty-one million, seven hundred sixty-eight thousand, six hundred eighty-five".