16502742369 has 9 divisors (see below), whose sum is σ = 23837851219. Its totient is φ = 11001571320.

The previous prime is 16502742317. The next prime is 16502742419. The reversal of 16502742369 is 96324720561.

The square root of 16502742369 is 128463.

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

16502742369 is a `hidden beast` number, since 16 + 5 + 0 + 274 + 2 + 369 = 666.

It can be written as a sum of positive squares in only one way, i.e., 732405969 + 15770336400 = 27063^2 + 125580^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 16502742369 - 2²⁹ = 15965871457 is a prime.

It is a super-2 number, since 2×16502742369² (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 (16502742169) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 363979 + ... + 406799.

Almost surely, 2^16502742369 is an apocalyptic number.

16502742369 is the 128463-rd square number.

16502742369 is the 64232-nd centered octagonal number.

It is an amenable number.

16502742369 is a deficient number, since it is larger than the sum of its proper divisors (7335108850).

16502742369 is an frugal number, since it uses more digits than its factorization.

16502742369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85648 (or 42824 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 16502742369 in words is "sixteen billion, five hundred two million, seven hundred forty-two thousand, three hundred sixty-nine".