25665232320 has 1344 divisors, whose sum is σ = 117090017280. Its totient is φ = 5240401920.

The previous prime is 25665232279. The next prime is 25665232321. The reversal of 25665232320 is 2323256652.

25665232320 is a `hidden beast` number, since 2 + 566 + 52 + 3 + 23 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665232321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 827910705 + ... + 827910735.

Almost surely, 2^25665232320 is an apocalyptic number.

25665232320 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 25665232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58545008640).

25665232320 is an abundant number, since it is smaller than the sum of its proper divisors (91424784960).

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

25665232320 is an equidigital number, since it uses as much as digits as its factorization.

25665232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 25665232320 its reverse (2323256652), we get a palindrome (27988488972).

The spelling of 25665232320 in words is "twenty-five billion, six hundred sixty-five million, two hundred thirty-two thousand, three hundred twenty".