25957981560 has 128 divisors (see below), whose sum is σ = 90892523520. Its totient is φ = 5807004672.

The previous prime is 25957981531. The next prime is 25957981573. The reversal of 25957981560 is 6518975952.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25957981560.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289269 + ... + 368228.

It is an arithmetic number, because the mean of its divisors is an integer number (710097840).

Almost surely, 2^25957981560 is an apocalyptic number.

25957981560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25957981560 is an abundant number, since it is smaller than the sum of its proper divisors (64934541960).

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

25957981560 is a wasteful number, since it uses less digits than its factorization.

25957981560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657565 (or 657561 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 57.

The spelling of 25957981560 in words is "twenty-five billion, nine hundred fifty-seven million, nine hundred eighty-one thousand, five hundred sixty".