12309565842 has 64 divisors (see below), whose sum is σ = 31339219200. Its totient is φ = 3508375680.

The previous prime is 12309565837. The next prime is 12309565859. The reversal of 12309565842 is 24856590321.

12309565842 is a `hidden beast` number, since 1 + 2 + 3 + 0 + 9 + 565 + 84 + 2 = 666.

12309565842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12309565842² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 114792 + ... + 194412.

It is an arithmetic number, because the mean of its divisors is an integer number (489675300).

Almost surely, 2^12309565842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12309565842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15669609600).

12309565842 is an abundant number, since it is smaller than the sum of its proper divisors (19029653358).

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

12309565842 is a wasteful number, since it uses less digits than its factorization.

12309565842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80048 (or 80042 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 12309565842 in words is "twelve billion, three hundred nine million, five hundred sixty-five thousand, eight hundred forty-two".