12439823065 has 24 divisors (see below), whose sum is σ = 15578191944. Its totient is φ = 9535104000.

The previous prime is 12439823059. The next prime is 12439823107. The reversal of 12439823065 is 56032893421.

It can be written as a sum of positive squares in 4 ways, for example, as 3299698249 + 9140124816 = 57443^2 + 95604^2 .

It is not a de Polignac number, because 12439823065 - 2⁹ = 12439822553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472489 + ... + 498121.

It is an arithmetic number, because the mean of its divisors is an integer number (649091331).

Almost surely, 2^12439823065 is an apocalyptic number.

It is an amenable number.

12439823065 is a deficient number, since it is larger than the sum of its proper divisors (3138368879).

12439823065 is a wasteful number, since it uses less digits than its factorization.

12439823065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25801 (or 25770 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 12439823065 in words is "twelve billion, four hundred thirty-nine million, eight hundred twenty-three thousand, sixty-five".