25651221316 has 96 divisors (see below), whose sum is σ = 54404259840. Its totient is φ = 10345256064.

The previous prime is 25651221313. The next prime is 25651221331. The reversal of 25651221316 is 61312215652.

It is not an unprimeable number, because it can be changed into a prime (25651221313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17653246 + ... + 17654698.

It is an arithmetic number, because the mean of its divisors is an integer number (566711040).

Almost surely, 2^25651221316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25651221316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27202129920).

25651221316 is an abundant number, since it is smaller than the sum of its proper divisors (28753038524).

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

25651221316 is a wasteful number, since it uses less digits than its factorization.

25651221316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1911 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

Adding to 25651221316 its reverse (61312215652), we get a palindrome (86963436968).

The spelling of 25651221316 in words is "twenty-five billion, six hundred fifty-one million, two hundred twenty-one thousand, three hundred sixteen".