25845474816 has 400 divisors, whose sum is σ = 93366050976. Its totient is φ = 6948716544.

The previous prime is 25845474797. The next prime is 25845474827. The reversal of 25845474816 is 61847454852.

25845474816 is a `hidden beast` number, since 2 + 5 + 84 + 547 + 4 + 8 + 16 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4932550 + ... + 4937786.

Almost surely, 2^25845474816 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 25845474816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46683025488).

25845474816 is an abundant number, since it is smaller than the sum of its proper divisors (67520576160).

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

25845474816 is an equidigital number, since it uses as much as digits as its factorization.

25845474816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291 (or 5266 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 54.

The spelling of 25845474816 in words is "twenty-five billion, eight hundred forty-five million, four hundred seventy-four thousand, eight hundred sixteen".