25697936256 has 64 divisors (see below), whose sum is σ = 68409976080. Its totient is φ = 8547176448.

The previous prime is 25697936227. The next prime is 25697936293. The reversal of 25697936256 is 65263979652.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25697936256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102270 + ... + 248706.

Almost surely, 2^25697936256 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 25697936256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34204988040).

25697936256 is an abundant number, since it is smaller than the sum of its proper divisors (42712039824).

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

25697936256 is a wasteful number, since it uses less digits than its factorization.

25697936256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146911 (or 146899 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 60.

The spelling of 25697936256 in words is "twenty-five billion, six hundred ninety-seven million, nine hundred thirty-six thousand, two hundred fifty-six".