66889319393 has 4 divisors (see below), whose sum is σ = 72034651668. Its totient is φ = 61743987120.

The previous prime is 66889319383. The next prime is 66889319407. The reversal of 66889319393 is 39391398866.

66889319393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31297855744 + 35591463649 = 176912^2 + 188657^2 .

It is a cyclic number.

It is not a de Polignac number, because 66889319393 - 2³⁴ = 49709450209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66889319303) 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, 2572666118 + ... + 2572666143.

It is an arithmetic number, because the mean of its divisors is an integer number (18008662917).

Almost surely, 2^66889319393 is an apocalyptic number.

It is an amenable number.

66889319393 is a deficient number, since it is larger than the sum of its proper divisors (5145332275).

66889319393 is a wasteful number, since it uses less digits than its factorization.

66889319393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145332274.

The product of its digits is 45349632, while the sum is 65.

The spelling of 66889319393 in words is "sixty-six billion, eight hundred eighty-nine million, three hundred nineteen thousand, three hundred ninety-three".