12723163209 has 45 divisors (see below), whose sum is σ = 19366203549. Its totient is φ = 8324418600.

The previous prime is 12723163183. The next prime is 12723163223. The reversal of 12723163209 is 90236132721.

The square root of 12723163209 is 112797.

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

12723163209 is a `hidden beast` number, since 12 + 7 + 2 + 3 + 1 + 632 + 0 + 9 = 666.

It is not a de Polignac number, because 12723163209 - 2¹³ = 12723155017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12723163259) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 84259284 + ... + 84259434.

Almost surely, 2^12723163209 is an apocalyptic number.

12723163209 is the 112797-th square number.

12723163209 is the 56399-th centered octagonal number.

It is an amenable number.

12723163209 is a deficient number, since it is larger than the sum of its proper divisors (6643040340).

12723163209 is an frugal number, since it uses more digits than its factorization.

12723163209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

Multiplying 12723163209 by its sum of digits (36), we get a square (458033875524 = 676782²).

The spelling of 12723163209 in words is "twelve billion, seven hundred twenty-three million, one hundred sixty-three thousand, two hundred nine".