25854115840 has 128 divisors (see below), whose sum is σ = 70916209920. Its totient is φ = 8863875072.

The previous prime is 25854115823. The next prime is 25854115843. The reversal of 25854115840 is 4851145852.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (25854115843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135609 + ... + 1158151.

It is an arithmetic number, because the mean of its divisors is an integer number (554032890).

Almost surely, 2^25854115840 is an apocalyptic number.

25854115840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25854115840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35458104960).

25854115840 is an abundant number, since it is smaller than the sum of its proper divisors (45062094080).

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

25854115840 is an frugal number, since it uses more digits than its factorization.

25854115840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22585 (or 22557 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 43.

The spelling of 25854115840 in words is "twenty-five billion, eight hundred fifty-four million, one hundred fifteen thousand, eight hundred forty".