25689628809 has 48 divisors (see below), whose sum is σ = 42586532352. Its totient is φ = 14799844224.

The previous prime is 25689628807. The next prime is 25689628849. The reversal of 25689628809 is 90882698652.

25689628809 is a `hidden beast` number, since 2 + 568 + 9 + 62 + 8 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 25689628809 - 2¹ = 25689628807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25689628807) 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 47 ways as a sum of consecutive naturals, for example, 24919 + ... + 228035.

It is an arithmetic number, because the mean of its divisors is an integer number (887219424).

Almost surely, 2^25689628809 is an apocalyptic number.

It is an amenable number.

25689628809 is a deficient number, since it is larger than the sum of its proper divisors (16896903543).

25689628809 is a wasteful number, since it uses less digits than its factorization.

25689628809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203206 (or 203203 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 25689628809 in words is "twenty-five billion, six hundred eighty-nine million, six hundred twenty-eight thousand, eight hundred nine".