25478990239 has 4 divisors (see below), whose sum is σ = 25493796720. Its totient is φ = 25464183760.

The previous prime is 25478990219. The next prime is 25478990249. The reversal of 25478990239 is 93209987452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25478990239 - 2²¹ = 25476893087 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 (25478990219) 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, 7400659 + ... + 7404100.

It is an arithmetic number, because the mean of its divisors is an integer number (6373449180).

Almost surely, 2^25478990239 is an apocalyptic number.

25478990239 is a deficient number, since it is larger than the sum of its proper divisors (14806481).

25478990239 is a wasteful number, since it uses less digits than its factorization.

25478990239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14806480.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 25478990239 in words is "twenty-five billion, four hundred seventy-eight million, nine hundred ninety thousand, two hundred thirty-nine".