15965234009 has 4 divisors (see below), whose sum is σ = 16046276004. Its totient is φ = 15884192016.

The previous prime is 15965233997. The next prime is 15965234017. The reversal of 15965234009 is 90043256951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13132014025 + 2833219984 = 114595^2 + 53228^2 .

It is a cyclic number.

It is not a de Polignac number, because 15965234009 - 2⁴ = 15965233993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15965234209) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40520702 + ... + 40521095.

It is an arithmetic number, because the mean of its divisors is an integer number (4011569001).

Almost surely, 2^15965234009 is an apocalyptic number.

It is an amenable number.

15965234009 is a deficient number, since it is larger than the sum of its proper divisors (81041995).

15965234009 is an equidigital number, since it uses as much as digits as its factorization.

15965234009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81041994.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 15965234009 in words is "fifteen billion, nine hundred sixty-five million, two hundred thirty-four thousand, nine".