19965336209 has 24 divisors (see below), whose sum is σ = 25020632448. Its totient is φ = 15790995360.

The previous prime is 19965336191. The next prime is 19965336217. The reversal of 19965336209 is 90263356991.

It is not a de Polignac number, because 19965336209 - 2²⁰ = 19964287633 is a prime.

It is a super-2 number, since 2×19965336209² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (19965336229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2921054 + ... + 2927880.

It is an arithmetic number, because the mean of its divisors is an integer number (1042526352).

Almost surely, 2^19965336209 is an apocalyptic number.

It is an amenable number.

19965336209 is a deficient number, since it is larger than the sum of its proper divisors (5055296239).

19965336209 is a wasteful number, since it uses less digits than its factorization.

19965336209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11445 (or 11438 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 53.

The spelling of 19965336209 in words is "nineteen billion, nine hundred sixty-five million, three hundred thirty-six thousand, two hundred nine".