19984007866 has 16 divisors (see below), whose sum is σ = 30735993960. Its totient is φ = 9739134720.

The previous prime is 19984007843. The next prime is 19984007921. The reversal of 19984007866 is 66870048991.

It can be written as a sum of positive squares in 4 ways, for example, as 5795624641 + 14188383225 = 76129^2 + 119115^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19984007866.

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 7 ways as a sum of consecutive naturals, for example, 26331 + ... + 201646.

Almost surely, 2^19984007866 is an apocalyptic number.

19984007866 is a deficient number, since it is larger than the sum of its proper divisors (10751986094).

19984007866 is a wasteful number, since it uses less digits than its factorization.

19984007866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229089.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 19984007866 in words is "nineteen billion, nine hundred eighty-four million, seven thousand, eight hundred sixty-six".