16438965309 has 56 divisors (see below), whose sum is σ = 26864191200. Its totient is φ = 9993925152.

The previous prime is 16438965287. The next prime is 16438965349. The reversal of 16438965309 is 90356983461.

16438965309 is a `hidden beast` number, since 16 + 4 + 3 + 8 + 96 + 530 + 9 = 666.

It is not a de Polignac number, because 16438965309 - 2²⁸ = 16170529853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16438965349) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 776142 + ... + 797040.

It is an arithmetic number, because the mean of its divisors is an integer number (479717700).

Almost surely, 2^16438965309 is an apocalyptic number.

It is an amenable number.

16438965309 is a deficient number, since it is larger than the sum of its proper divisors (10425225891).

16438965309 is an equidigital number, since it uses as much as digits as its factorization.

16438965309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21013 (or 20998 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 16438965309 in words is "sixteen billion, four hundred thirty-eight million, nine hundred sixty-five thousand, three hundred nine".