19999666834506 has 16 divisors (see below), whose sum is σ = 44443704076800. Its totient is φ = 6666555611484.

The previous prime is 19999666834409. The next prime is 19999666834529. The reversal of 19999666834506 is 60543866699991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185182100266 + ... + 185182100373.

It is an arithmetic number, because the mean of its divisors is an integer number (2777731504800).

Almost surely, 2^{19999666834506} is an apocalyptic number.

19999666834506 is an abundant number, since it is smaller than the sum of its proper divisors (24444037242294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19999666834506 is a wasteful number, since it uses less digits than its factorization.

19999666834506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370364200650 (or 370364200644 counting only the distinct ones).

The product of its (nonzero) digits is 4081466880, while the sum is 81.

The spelling of 19999666834506 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred sixty-six million, eight hundred thirty-four thousand, five hundred six".