25600905209 has 32 divisors (see below), whose sum is σ = 29212140672. Its totient is φ = 22415976000.

The previous prime is 25600905139. The next prime is 25600905241. The reversal of 25600905209 is 90250900652.

It is a de Polignac number, because none of the positive numbers 2^k-25600905209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25600905299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4971374 + ... + 4976520.

It is an arithmetic number, because the mean of its divisors is an integer number (912879396).

Almost surely, 2^25600905209 is an apocalyptic number.

It is an amenable number.

25600905209 is a deficient number, since it is larger than the sum of its proper divisors (3611235463).

25600905209 is a wasteful number, since it uses less digits than its factorization.

25600905209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318 (or 5296 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 25600905209 in words is "twenty-five billion, six hundred million, nine hundred five thousand, two hundred nine".