66189331863 has 24 divisors (see below), whose sum is σ = 95794189920. Its totient is φ = 44039823360.

The previous prime is 66189331823. The next prime is 66189331889. The reversal of 66189331863 is 36813398166.

66189331863 is a `hidden beast` number, since 6 + 618 + 9 + 3 + 3 + 18 + 6 + 3 = 666.

It is not a de Polignac number, because 66189331863 - 2¹⁶ = 66189266327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66189331823) 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 23 ways as a sum of consecutive naturals, for example, 19880983 + ... + 19884311.

It is an arithmetic number, because the mean of its divisors is an integer number (3991424580).

Almost surely, 2^66189331863 is an apocalyptic number.

66189331863 is a deficient number, since it is larger than the sum of its proper divisors (29604858057).

66189331863 is a wasteful number, since it uses less digits than its factorization.

66189331863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999 (or 6996 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The spelling of 66189331863 in words is "sixty-six billion, one hundred eighty-nine million, three hundred thirty-one thousand, eight hundred sixty-three".