25535447856 has 160 divisors (see below), whose sum is σ = 77691902400. Its totient is φ = 8002437120.

The previous prime is 25535447851. The next prime is 25535447867. The reversal of 25535447856 is 65874453552.

25535447856 is a `hidden beast` number, since 2 + 553 + 5 + 4 + 4 + 7 + 85 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (25535447851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11815416 + ... + 11817576.

It is an arithmetic number, because the mean of its divisors is an integer number (485574390).

Almost surely, 2^25535447856 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 25535447856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38845951200).

25535447856 is an abundant number, since it is smaller than the sum of its proper divisors (52156454544).

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

25535447856 is a wasteful number, since it uses less digits than its factorization.

25535447856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804 (or 3792 counting only the distinct ones).

The product of its digits is 20160000, while the sum is 54.

The spelling of 25535447856 in words is "twenty-five billion, five hundred thirty-five million, four hundred forty-seven thousand, eight hundred fifty-six".