25881055209 has 24 divisors (see below), whose sum is σ = 38312531712. Its totient is φ = 16825740480.

The previous prime is 25881055201. The next prime is 25881055229. The reversal of 25881055209 is 90255018852.

It is a happy number.

25881055209 is a `hidden beast` number, since 2 + 5 + 88 + 10 + 552 + 0 + 9 = 666.

It is not a de Polignac number, because 25881055209 - 2³ = 25881055201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25881055201) 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 23 ways as a sum of consecutive naturals, for example, 888612 + ... + 917274.

It is an arithmetic number, because the mean of its divisors is an integer number (1596355488).

Almost surely, 2^25881055209 is an apocalyptic number.

It is an amenable number.

25881055209 is a deficient number, since it is larger than the sum of its proper divisors (12431476503).

25881055209 is a wasteful number, since it uses less digits than its factorization.

25881055209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31157 (or 31154 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The spelling of 25881055209 in words is "twenty-five billion, eight hundred eighty-one million, fifty-five thousand, two hundred nine".