25538880389 has 4 divisors (see below), whose sum is σ = 27860596800. Its totient is φ = 23217163980.

The previous prime is 25538880349. The next prime is 25538880401. The reversal of 25538880389 is 98308883552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25538880389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25538880349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160858189 + ... + 1160858210.

It is an arithmetic number, because the mean of its divisors is an integer number (6965149200).

Almost surely, 2^25538880389 is an apocalyptic number.

It is an amenable number.

25538880389 is a deficient number, since it is larger than the sum of its proper divisors (2321716411).

25538880389 is a wasteful number, since it uses less digits than its factorization.

25538880389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321716410.

The product of its (nonzero) digits is 16588800, while the sum is 59.

The spelling of 25538880389 in words is "twenty-five billion, five hundred thirty-eight million, eight hundred eighty thousand, three hundred eighty-nine".