16693415209 has 9 divisors (see below), whose sum is σ = 17062358007. Its totient is φ = 16332292824.

The previous prime is 16693415201. The next prime is 16693415227. The reversal of 16693415209 is 90251439661.

The square root of 16693415209 is 129203.

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

It can be written as a sum of positive squares in only one way, i.e., 1989427609 + 14703987600 = 44603^2 + 121260^2 .

It is not a de Polignac number, because 16693415209 - 2³ = 16693415201 is a prime.

It is a super-2 number, since 2×16693415209² (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 (16693415201) 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, 6071167 + ... + 6073915.

Almost surely, 2^16693415209 is an apocalyptic number.

16693415209 is the 129203-rd square number.

16693415209 is the 64602-nd centered octagonal number.

It is an amenable number.

16693415209 is a deficient number, since it is larger than the sum of its proper divisors (368942798).

16693415209 is an frugal number, since it uses more digits than its factorization.

16693415209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 16693415209 in words is "sixteen billion, six hundred ninety-three million, four hundred fifteen thousand, two hundred nine".