25215328512 has 504 divisors, whose sum is σ = 83966113728. Its totient is φ = 7489843200.

The previous prime is 25215328511. The next prime is 25215328517. The reversal of 25215328512 is 21582351252.

25215328512 is a `hidden beast` number, since 2 + 521 + 53 + 2 + 85 + 1 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (25215328511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 145753258 + ... + 145753430.

It is an arithmetic number, because the mean of its divisors is an integer number (166599432).

Almost surely, 2^25215328512 is an apocalyptic number.

25215328512 is a gapful number since it is divisible by the number (22) 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 25215328512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41983056864).

25215328512 is an abundant number, since it is smaller than the sum of its proper divisors (58750785216).

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

25215328512 is an equidigital number, since it uses as much as digits as its factorization.

25215328512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 260 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 25215328512 its reverse (21582351252), we get a palindrome (46797679764).

The spelling of 25215328512 in words is "twenty-five billion, two hundred fifteen million, three hundred twenty-eight thousand, five hundred twelve".