19205865066 has 32 divisors (see below), whose sum is σ = 38949704640. Its totient is φ = 6312345984.

The previous prime is 19205865043. The next prime is 19205865071. The reversal of 19205865066 is 66056850291.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2713380 + ... + 2720448.

It is an arithmetic number, because the mean of its divisors is an integer number (1217178270).

Almost surely, 2^19205865066 is an apocalyptic number.

19205865066 is an abundant number, since it is smaller than the sum of its proper divisors (19743839574).

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

19205865066 is a wasteful number, since it uses less digits than its factorization.

19205865066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13350.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 19205865066 in words is "nineteen billion, two hundred five million, eight hundred sixty-five thousand, sixty-six".