25240400256 has 64 divisors (see below), whose sum is σ = 67155886080. Its totient is φ = 8399528448.

The previous prime is 25240400239. The next prime is 25240400257. The reversal of 25240400256 is 65200404252.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25240400257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178945 + ... + 287231.

It is an arithmetic number, because the mean of its divisors is an integer number (1049310720).

Almost surely, 2^25240400256 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 25240400256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33577943040).

25240400256 is an abundant number, since it is smaller than the sum of its proper divisors (41915485824).

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

25240400256 is a wasteful number, since it uses less digits than its factorization.

25240400256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108911 (or 108899 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 25240400256 in words is "twenty-five billion, two hundred forty million, four hundred thousand, two hundred fifty-six".