1966685984563 has 16 divisors (see below), whose sum is σ = 2091132755712. Its totient is φ = 1846564992000.

The previous prime is 1966685984551. The next prime is 1966685984611. The reversal of 1966685984563 is 3654895866691.

It is a cyclic number.

It is not a de Polignac number, because 1966685984563 - 2⁹ = 1966685984051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966685984563.

It is not an unprimeable number, because it can be changed into a prime (1966685984063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4044406 + ... + 4504507.

It is an arithmetic number, because the mean of its divisors is an integer number (130695797232).

Almost surely, 2^{1966685984563} is an apocalyptic number.

1966685984563 is a deficient number, since it is larger than the sum of its proper divisors (124446771149).

1966685984563 is a wasteful number, since it uses less digits than its factorization.

1966685984563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8549166.

The product of its digits is 2015539200, while the sum is 76.

The spelling of 1966685984563 in words is "one trillion, nine hundred sixty-six billion, six hundred eighty-five million, nine hundred eighty-four thousand, five hundred sixty-three".