25801996899840 has 2560 divisors, whose sum is σ = 106351099379712. Its totient is φ = 5202247680000.

The previous prime is 25801996899829. The next prime is 25801996899893. The reversal of 25801996899840 is 4899869910852.

It is a tau number, because it is divible by the number of its divisors (2560).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 203165329857 + ... + 203165329983.

Almost surely, 2^{25801996899840} is an apocalyptic number.

25801996899840 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 25801996899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53175549689856).

25801996899840 is an abundant number, since it is smaller than the sum of its proper divisors (80549102479872).

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

25801996899840 is a wasteful number, since it uses less digits than its factorization.

25801996899840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 806215680, while the sum is 78.

The spelling of 25801996899840 in words is "twenty-five trillion, eight hundred one billion, nine hundred ninety-six million, eight hundred ninety-nine thousand, eight hundred forty".