66839795227 has 4 divisors (see below), whose sum is σ = 66908916976. Its totient is φ = 66770673480.

The previous prime is 66839795189. The next prime is 66839795263. The reversal of 66839795227 is 72259793866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66839795227 - 2¹⁵ = 66839762459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66839798227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34559424 + ... + 34561357.

It is an arithmetic number, because the mean of its divisors is an integer number (16727229244).

Almost surely, 2^66839795227 is an apocalyptic number.

66839795227 is a deficient number, since it is larger than the sum of its proper divisors (69121749).

66839795227 is an equidigital number, since it uses as much as digits as its factorization.

66839795227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69121748.

The product of its digits is 68584320, while the sum is 64.

The spelling of 66839795227 in words is "sixty-six billion, eight hundred thirty-nine million, seven hundred ninety-five thousand, two hundred twenty-seven".