25971984198 has 48 divisors (see below), whose sum is σ = 59199800400. Its totient is φ = 8217115200.

The previous prime is 25971984191. The next prime is 25971984217. The reversal of 25971984198 is 89148917952.

25971984198 is a `hidden beast` number, since 25 + 9 + 7 + 198 + 419 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25971984191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390853 + ... + 452448.

It is an arithmetic number, because the mean of its divisors is an integer number (1233329175).

Almost surely, 2^25971984198 is an apocalyptic number.

25971984198 is an abundant number, since it is smaller than the sum of its proper divisors (33227816202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25971984198 is a wasteful number, since it uses less digits than its factorization.

25971984198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843397 (or 843394 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 25971984198 in words is "twenty-five billion, nine hundred seventy-one million, nine hundred eighty-four thousand, one hundred ninety-eight".