25991905968 has 280 divisors, whose sum is σ = 86604948000. Its totient is φ = 7399268352.

The previous prime is 25991905889. The next prime is 25991906021. The reversal of 25991905968 is 86950919952.

25991905968 is a `hidden beast` number, since 25 + 9 + 9 + 19 + 0 + 596 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 36659598 + ... + 36660306.

Almost surely, 2^25991905968 is an apocalyptic number.

25991905968 is a gapful number since it is divisible by the number (28) 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 25991905968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43302474000).

25991905968 is an abundant number, since it is smaller than the sum of its proper divisors (60613042032).

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

25991905968 is an equidigital number, since it uses as much as digits as its factorization.

25991905968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 63.

The spelling of 25991905968 in words is "twenty-five billion, nine hundred ninety-one million, nine hundred five thousand, nine hundred sixty-eight".