16706338009 has 9 divisors (see below), whose sum is σ = 17306166397. Its totient is φ = 16126638304.

The previous prime is 16706337961. The next prime is 16706338021. The reversal of 16706338009 is 90083360761.

The square root of 16706338009 is 129253.

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 887742025 + 15818595984 = 29795^2 + 125772^2 .

It is not a de Polignac number, because 16706338009 - 2¹³ = 16706329817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16706338109) 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, 3746109 + ... + 3750565.

Almost surely, 2^16706338009 is an apocalyptic number.

16706338009 is the 129253-rd square number.

16706338009 is the 64627-th centered octagonal number.

It is an amenable number.

16706338009 is a deficient number, since it is larger than the sum of its proper divisors (599828388).

16706338009 is an frugal number, since it uses more digits than its factorization.

16706338009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972 (or 4486 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 16706338009 in words is "sixteen billion, seven hundred six million, three hundred thirty-eight thousand, nine".