25189816368 has 80 divisors (see below), whose sum is σ = 69079551840. Its totient is φ = 7882272768.

The previous prime is 25189816363. The next prime is 25189816391. The reversal of 25189816368 is 86361898152.

It is a Cunningham number, because it is equal to 158713²-1.

It is a super-2 number, since 2×25189816368² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25189816363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277746 + ... + 357102.

It is an arithmetic number, because the mean of its divisors is an integer number (863494398).

Almost surely, 2^25189816368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25189816368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34539775920).

25189816368 is an abundant number, since it is smaller than the sum of its proper divisors (43889735472).

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

25189816368 is a wasteful number, since it uses less digits than its factorization.

25189816368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79774 (or 79768 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 57.

The spelling of 25189816368 in words is "twenty-five billion, one hundred eighty-nine million, eight hundred sixteen thousand, three hundred sixty-eight".