25436121568 has 192 divisors, whose sum is σ = 60021948672. Its totient is φ = 10459054080.

The previous prime is 25436121563. The next prime is 25436121583. The reversal of 25436121568 is 86512163452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25436121563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73302771 + ... + 73303117.

It is an arithmetic number, because the mean of its divisors is an integer number (312614316).

Almost surely, 2^25436121568 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 25436121568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30010974336).

25436121568 is an abundant number, since it is smaller than the sum of its proper divisors (34585827104).

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

25436121568 is a wasteful number, since it uses less digits than its factorization.

25436121568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 649 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The spelling of 25436121568 in words is "twenty-five billion, four hundred thirty-six million, one hundred twenty-one thousand, five hundred sixty-eight".