25643433078828 has 72 divisors (see below), whose sum is σ = 66331681049088. Its totient is φ = 8349310336608.

The previous prime is 25643433078799. The next prime is 25643433078829. The reversal of 25643433078828 is 82887033434652.

25643433078828 is a `hidden beast` number, since 2 + 56 + 4 + 3 + 433 + 0 + 78 + 82 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (25643433078829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14214226 + ... + 15916377.

It is an arithmetic number, because the mean of its divisors is an integer number (921273347904).

Almost surely, 2^{25643433078828} is an apocalyptic number.

It is an amenable number.

25643433078828 is an abundant number, since it is smaller than the sum of its proper divisors (40688247970260).

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

25643433078828 is a wasteful number, since it uses less digits than its factorization.

25643433078828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30131163 (or 30131158 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 63.

The spelling of 25643433078828 in words is "twenty-five trillion, six hundred forty-three billion, four hundred thirty-three million, seventy-eight thousand, eight hundred twenty-eight".