25999496640 has 1120 divisors, whose sum is σ = 109049149440. Its totient is φ = 5822668800.

The previous prime is 25999496617. The next prime is 25999496641. The reversal of 25999496640 is 4669499952.

25999496640 is a `hidden beast` number, since 2 + 59 + 99 + 496 + 6 + 4 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25999496641) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 198469375 + ... + 198469505.

It is an arithmetic number, because the mean of its divisors is an integer number (97365312).

Almost surely, 2^25999496640 is an apocalyptic number.

25999496640 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 25999496640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54524574720).

25999496640 is an abundant number, since it is smaller than the sum of its proper divisors (83049652800).

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

25999496640 is a wasteful number, since it uses less digits than its factorization.

25999496640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 63.

The spelling of 25999496640 in words is "twenty-five billion, nine hundred ninety-nine million, four hundred ninety-six thousand, six hundred forty".