1966845889 has 16 divisors (see below), whose sum is σ = 2175120000. Its totient is φ = 1770557184.

The previous prime is 1966845877. The next prime is 1966845899. The reversal of 1966845889 is 9885486691.

It is a cyclic number.

It is not a de Polignac number, because 1966845889 - 2²⁵ = 1933291457 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 1966845889.

It is not an unprimeable number, because it can be changed into a prime (1966845899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10612 + ... + 63610.

It is an arithmetic number, because the mean of its divisors is an integer number (135945000).

Almost surely, 2^1966845889 is an apocalyptic number.

It is an amenable number.

1966845889 is a deficient number, since it is larger than the sum of its proper divisors (208274111).

1966845889 is a wasteful number, since it uses less digits than its factorization.

1966845889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53112.

The product of its digits is 29859840, while the sum is 64.

The square root of 1966845889 is about 44349.1362824576. The cubic root of 1966845889 is about 1252.9202951746.

The spelling of 1966845889 in words is "one billion, nine hundred sixty-six million, eight hundred forty-five thousand, eight hundred eighty-nine".