16909621369 has 9 divisors (see below), whose sum is σ = 17080496013. Its totient is φ = 16740443232.

The previous prime is 16909621363. The next prime is 16909621409. The reversal of 16909621369 is 96312690961.

The square root of 16909621369 is 130037.

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

It can be written as a sum of positive squares in 4 ways, for example, as 777573225 + 16132048144 = 27885^2 + 127012^2 .

It is not a de Polignac number, because 16909621369 - 2³ = 16909621361 is a prime.

It is a super-2 number, since 2×16909621369² (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 (16909621361) 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, 14173437 + ... + 14174629.

Almost surely, 2^16909621369 is an apocalyptic number.

16909621369 is the 130037-th square number.

16909621369 is the 65019-th centered octagonal number.

It is an amenable number.

16909621369 is a deficient number, since it is larger than the sum of its proper divisors (170874644).

16909621369 is an frugal number, since it uses more digits than its factorization.

16909621369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 52.

The spelling of 16909621369 in words is "sixteen billion, nine hundred nine million, six hundred twenty-one thousand, three hundred sixty-nine".