19886907209 has 8 divisors (see below), whose sum is σ = 22155175560. Its totient is φ = 17724139776.

The previous prime is 19886907199. The next prime is 19886907211. The reversal of 19886907209 is 90270968891.

It can be written as a sum of positive squares in 4 ways, for example, as 2092147600 + 17794759609 = 45740^2 + 133397^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19886907209 - 2¹⁶ = 19886841673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19886907269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26374832 + ... + 26375585.

It is an arithmetic number, because the mean of its divisors is an integer number (2769396945).

Almost surely, 2^19886907209 is an apocalyptic number.

It is an amenable number.

19886907209 is a deficient number, since it is larger than the sum of its proper divisors (2268268351).

19886907209 is a wasteful number, since it uses less digits than its factorization.

19886907209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52750459.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The spelling of 19886907209 in words is "nineteen billion, eight hundred eighty-six million, nine hundred seven thousand, two hundred nine".