25478990218 has 8 divisors (see below), whose sum is σ = 41692893120. Its totient is φ = 11581359180.

The previous prime is 25478990213. The next prime is 25478990219. The reversal of 25478990218 is 81209987452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25478990213) 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, 579067938 + ... + 579067981.

It is an arithmetic number, because the mean of its divisors is an integer number (5211611640).

Almost surely, 2^25478990218 is an apocalyptic number.

25478990218 is a deficient number, since it is larger than the sum of its proper divisors (16213902902).

25478990218 is a wasteful number, since it uses less digits than its factorization.

25478990218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158135932.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 25478990218 in words is "twenty-five billion, four hundred seventy-eight million, nine hundred ninety thousand, two hundred eighteen".