25138888889 has 16 divisors (see below), whose sum is σ = 25951242240. Its totient is φ = 24337272960.

The previous prime is 25138888883. The next prime is 25138888897. The reversal of 25138888889 is 98888883152.

It is a cyclic number.

It is not a de Polignac number, because 25138888889 - 2²⁴ = 25122111673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25138888883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8785319 + ... + 8788179.

It is an arithmetic number, because the mean of its divisors is an integer number (1621952640).

Almost surely, 2^25138888889 is an apocalyptic number.

It is an amenable number.

25138888889 is a deficient number, since it is larger than the sum of its proper divisors (812353351).

25138888889 is a wasteful number, since it uses less digits than its factorization.

25138888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640.

The product of its digits is 70778880, while the sum is 68.

The spelling of 25138888889 in words is "twenty-five billion, one hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".