66594772609 has 4 divisors (see below), whose sum is σ = 66595402800. Its totient is φ = 66594142420.

The previous prime is 66594772591. The next prime is 66594772619. The reversal of 66594772609 is 90627749566.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66594772609 - 2⁵ = 66594772577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66594772619) 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, 113659 + ... + 382240.

It is an arithmetic number, because the mean of its divisors is an integer number (16648850700).

Almost surely, 2^66594772609 is an apocalyptic number.

It is an amenable number.

66594772609 is a deficient number, since it is larger than the sum of its proper divisors (630191).

66594772609 is a wasteful number, since it uses less digits than its factorization.

66594772609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630190.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 66594772609 in words is "sixty-six billion, five hundred ninety-four million, seven hundred seventy-two thousand, six hundred nine".