66784258833 has 16 divisors (see below), whose sum is σ = 92237356800. Its totient is φ = 42931038080.

The previous prime is 66784258831. The next prime is 66784258837. The reversal of 66784258833 is 33885248766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66784258833 - 2¹ = 66784258831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66784258831) 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, 438153 + ... + 570566.

It is an arithmetic number, because the mean of its divisors is an integer number (5764834800).

Almost surely, 2^66784258833 is an apocalyptic number.

It is an amenable number.

66784258833 is a deficient number, since it is larger than the sum of its proper divisors (25453097967).

66784258833 is a wasteful number, since it uses less digits than its factorization.

66784258833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009512.

The product of its digits is 46448640, while the sum is 60.

The spelling of 66784258833 in words is "sixty-six billion, seven hundred eighty-four million, two hundred fifty-eight thousand, eight hundred thirty-three".