66493828799 has 4 divisors (see below), whose sum is σ = 66532199736. Its totient is φ = 66455457864.

The previous prime is 66493828777. The next prime is 66493828801. The reversal of 66493828799 is 99782839466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99782839466 = 2 ⋅49891419733.

It is a cyclic number.

It is not a de Polignac number, because 66493828799 - 2²⁰ = 66492780223 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 (66493828099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19182869 + ... + 19186334.

It is an arithmetic number, because the mean of its divisors is an integer number (16633049934).

Almost surely, 2^66493828799 is an apocalyptic number.

66493828799 is a deficient number, since it is larger than the sum of its proper divisors (38370937).

66493828799 is a wasteful number, since it uses less digits than its factorization.

66493828799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38370936.

The product of its digits is 282175488, while the sum is 71.

The spelling of 66493828799 in words is "sixty-six billion, four hundred ninety-three million, eight hundred twenty-eight thousand, seven hundred ninety-nine".