19969306502209 has 9 divisors (see below), whose sum is σ = 19997333233059. Its totient is φ = 19941319015320.

The previous prime is 19969306502161. The next prime is 19969306502219. The reversal of 19969306502209 is 90220560396991.

The square root of 19969306502209 is 4468703.

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., 5452444492209 + 14516862010000 = 2335047^2 + 3810100^2 .

It is not a de Polignac number, because 19969306502209 - 2¹¹ = 19969306500161 is a prime.

It is a super-2 number, since 2×19969306502209² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19969306502219) 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, 3668802442 + ... + 3668807884.

Almost surely, 2^{19969306502209} is an apocalyptic number.

19969306502209 is the 4468703-rd square number.

19969306502209 is the 2234352-nd centered octagonal number.

It is an amenable number.

19969306502209 is a deficient number, since it is larger than the sum of its proper divisors (28026730850).

19969306502209 is an frugal number, since it uses more digits than its factorization.

19969306502209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12528 (or 6264 counting only the distinct ones).

The product of its (nonzero) digits is 14171760, while the sum is 61.

The spelling of 19969306502209 in words is "nineteen trillion, nine hundred sixty-nine billion, three hundred six million, five hundred two thousand, two hundred nine".