66673393693 has 16 divisors (see below), whose sum is σ = 68876144640. Its totient is φ = 64513033200.

The previous prime is 66673393651. The next prime is 66673393751. The reversal of 66673393693 is 39639337666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66673393693 - 2⁹ = 66673393181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66673393093) 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, 1263288 + ... + 1315006.

It is an arithmetic number, because the mean of its divisors is an integer number (4304759040).

Almost surely, 2^66673393693 is an apocalyptic number.

It is an amenable number.

66673393693 is a deficient number, since it is larger than the sum of its proper divisors (2202750947).

66673393693 is a wasteful number, since it uses less digits than its factorization.

66673393693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52128.

The product of its digits is 59521392, while the sum is 61.

The spelling of 66673393693 in words is "sixty-six billion, six hundred seventy-three million, three hundred ninety-three thousand, six hundred ninety-three".