25128902889 has 24 divisors (see below), whose sum is σ = 37729141632. Its totient is φ = 16713663120.

The previous prime is 25128902873. The next prime is 25128902891. The reversal of 25128902889 is 98820982152.

It is a happy number.

25128902889 is a `hidden beast` number, since 251 + 28 + 90 + 288 + 9 = 666.

It is not a de Polignac number, because 25128902889 - 2⁴ = 25128902873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25128902809) 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, 15234 + ... + 224699.

It is an arithmetic number, because the mean of its divisors is an integer number (1572047568).

Almost surely, 2^25128902889 is an apocalyptic number.

It is an amenable number.

25128902889 is a deficient number, since it is larger than the sum of its proper divisors (12600238743).

25128902889 is an equidigital number, since it uses as much as digits as its factorization.

25128902889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240379 (or 240367 counting only the distinct ones).

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

The spelling of 25128902889 in words is "twenty-five billion, one hundred twenty-eight million, nine hundred two thousand, eight hundred eighty-nine".