12165265356 has 72 divisors (see below), whose sum is σ = 29994020784. Its totient is φ = 3837075840.

The previous prime is 12165265327. The next prime is 12165265381. The reversal of 12165265356 is 65356256121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6986646 + ... + 6988386.

It is an arithmetic number, because the mean of its divisors is an integer number (416583622).

Almost surely, 2^12165265356 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 12165265356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14997010392).

12165265356 is an abundant number, since it is smaller than the sum of its proper divisors (17828755428).

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

12165265356 is a wasteful number, since it uses less digits than its factorization.

12165265356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399 (or 3378 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The spelling of 12165265356 in words is "twelve billion, one hundred sixty-five million, two hundred sixty-five thousand, three hundred fifty-six".