66653456689 has 4 divisors (see below), whose sum is σ = 66670786624. Its totient is φ = 66636126756.

The previous prime is 66653456677. The next prime is 66653456699. The reversal of 66653456689 is 98665435666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66653456689 - 2⁷ = 66653456561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66653456689.

It is not an unprimeable number, because it can be changed into a prime (66653456699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8659197 + ... + 8666890.

It is an arithmetic number, because the mean of its divisors is an integer number (16667696656).

Almost surely, 2^66653456689 is an apocalyptic number.

It is an amenable number.

66653456689 is a deficient number, since it is larger than the sum of its proper divisors (17329935).

66653456689 is a wasteful number, since it uses less digits than its factorization.

66653456689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17329934.

The product of its digits is 167961600, while the sum is 64.

The spelling of 66653456689 in words is "sixty-six billion, six hundred fifty-three million, four hundred fifty-six thousand, six hundred eighty-nine".