16987733569 has 3 divisors (see below), whose sum is σ = 16987863907. Its totient is φ = 16987603232.

The previous prime is 16987733557. The next prime is 16987733573. The reversal of 16987733569 is 96533778961.

It is a happy number.

The square root of 16987733569 is 130337.

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

16987733569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96533778961 = 37 ⋅2609021053.

It can be written as a sum of positive squares in only one way, i.e., 16979393025 + 8340544 = 130305^2 + 2888^2 .

It is not a de Polignac number, because 16987733569 - 2¹¹ = 16987731521 is a prime.

It is a super-2 number, since 2×16987733569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16987733569.

It is not an unprimeable number, because it can be changed into a prime (16987733519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 65169 + ... + 195505.

Almost surely, 2^16987733569 is an apocalyptic number.

16987733569 is the 130337-th square number.

16987733569 is the 65169-th centered octagonal number.

It is an amenable number.

16987733569 is a deficient number, since it is larger than the sum of its proper divisors (130338).

16987733569 is an frugal number, since it uses more digits than its factorization.

16987733569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260674 (or 130337 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 64.

Multiplying 16987733569 by its sum of digits (64), we get a square (1087214948416 = 1042696²).

The spelling of 16987733569 in words is "sixteen billion, nine hundred eighty-seven million, seven hundred thirty-three thousand, five hundred sixty-nine".