25818902289 has 24 divisors (see below), whose sum is σ = 38013887912. Its totient is φ = 16882940160.

The previous prime is 25818902257. The next prime is 25818902297. The reversal of 25818902289 is 98220981852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 341954064 + 25476948225 = 18492^2 + 159615^2 .

It is not a de Polignac number, because 25818902289 - 2⁵ = 25818902257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25818902089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10359 + ... + 227475.

Almost surely, 2^25818902289 is an apocalyptic number.

It is an amenable number.

25818902289 is a deficient number, since it is larger than the sum of its proper divisors (12194985623).

25818902289 is a wasteful number, since it uses less digits than its factorization.

25818902289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217377 (or 217374 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 25818902289 in words is "twenty-five billion, eight hundred eighteen million, nine hundred two thousand, two hundred eighty-nine".