25525396512 has 576 divisors, whose sum is σ = 95103590400. Its totient is φ = 6541793280.

The previous prime is 25525396483. The next prime is 25525396529. The reversal of 25525396512 is 21569352552.

It is a happy number.

25525396512 is a `hidden beast` number, since 2 + 5 + 52 + 539 + 65 + 1 + 2 = 666.

It is a super-2 number, since 2×25525396512² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53288689 + ... + 53289167.

It is an arithmetic number, because the mean of its divisors is an integer number (165110400).

Almost surely, 2^25525396512 is an apocalyptic number.

25525396512 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 25525396512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47551795200).

25525396512 is an abundant number, since it is smaller than the sum of its proper divisors (69578193888).

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

25525396512 is a wasteful number, since it uses less digits than its factorization.

25525396512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 591 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The spelling of 25525396512 in words is "twenty-five billion, five hundred twenty-five million, three hundred ninety-six thousand, five hundred twelve".