25612231320 has 512 divisors, whose sum is σ = 94348800000. Its totient is φ = 6142169088.

The previous prime is 25612231319. The next prime is 25612231321. The reversal of 25612231320 is 2313221652.

It is a happy number.

25612231320 is a `hidden beast` number, since 2 + 5 + 612 + 23 + 1 + 3 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (25612231319) and next prime (25612231321).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25612231321) 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 127 ways as a sum of consecutive naturals, for example, 128704581 + ... + 128704779.

It is an arithmetic number, because the mean of its divisors is an integer number (184275000).

Almost surely, 2^25612231320 is an apocalyptic number.

25612231320 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 25612231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47174400000).

25612231320 is an abundant number, since it is smaller than the sum of its proper divisors (68736568680).

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

25612231320 is a wasteful number, since it uses less digits than its factorization.

25612231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 25612231320 its reverse (2313221652), we get a palindrome (27925452972).

The spelling of 25612231320 in words is "twenty-five billion, six hundred twelve million, two hundred thirty-one thousand, three hundred twenty".