16438573369 has 3 divisors (see below), whose sum is σ = 16438701583. Its totient is φ = 16438445156.

The previous prime is 16438573367. The next prime is 16438573397. The reversal of 16438573369 is 96337583461.

The square root of 16438573369 is 128213.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 16413453225 + 25120144 = 128115^2 + 5012^2 .

It is not a de Polignac number, because 16438573369 - 2¹ = 16438573367 is a prime.

It is a super-2 number, since 2×16438573369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16438573367) 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 2 ways as a sum of consecutive naturals, for example, 64107 + ... + 192319.

Almost surely, 2^16438573369 is an apocalyptic number.

16438573369 is the 128213-rd square number.

16438573369 is the 64107-th centered octagonal number.

It is an amenable number.

16438573369 is a deficient number, since it is larger than the sum of its proper divisors (128214).

16438573369 is an frugal number, since it uses more digits than its factorization.

16438573369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256426 (or 128213 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 55.

The spelling of 16438573369 in words is "sixteen billion, four hundred thirty-eight million, five hundred seventy-three thousand, three hundred sixty-nine".