25565325436 has 144 divisors (see below), whose sum is σ = 55763769600. Its totient is φ = 10038712320.

The previous prime is 25565325431. The next prime is 25565325449. The reversal of 25565325436 is 63452356552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565325431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56938140 + ... + 56938588.

It is an arithmetic number, because the mean of its divisors is an integer number (387248400).

Almost surely, 2^25565325436 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 25565325436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27881884800).

25565325436 is an abundant number, since it is smaller than the sum of its proper divisors (30198444164).

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

25565325436 is a wasteful number, since it uses less digits than its factorization.

25565325436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 651 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 46.

The spelling of 25565325436 in words is "twenty-five billion, five hundred sixty-five million, three hundred twenty-five thousand, four hundred thirty-six".