25663990590 has 384 divisors, whose sum is σ = 82775347200. Its totient is φ = 5715360000.

The previous prime is 25663990589. The next prime is 25663990603. The reversal of 25663990590 is 9509936652.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 34172715 + ... + 34173465.

It is an arithmetic number, because the mean of its divisors is an integer number (215560800).

Almost surely, 2^25663990590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25663990590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41387673600).

25663990590 is an abundant number, since it is smaller than the sum of its proper divisors (57111356610).

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

25663990590 is an equidigital number, since it uses as much as digits as its factorization.

25663990590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 54.

The spelling of 25663990590 in words is "twenty-five billion, six hundred sixty-three million, nine hundred ninety thousand, five hundred ninety".