66636442609 has 8 divisors (see below), whose sum is σ = 72759046752. Its totient is φ = 60524629440.

The previous prime is 66636442571. The next prime is 66636442627. The reversal of 66636442609 is 90624463666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66636442609 - 2¹¹ = 66636440561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66636442009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2684824 + ... + 2709529.

It is an arithmetic number, because the mean of its divisors is an integer number (9094880844).

Almost surely, 2^66636442609 is an apocalyptic number.

It is an amenable number.

66636442609 is a deficient number, since it is larger than the sum of its proper divisors (6122604143).

66636442609 is a wasteful number, since it uses less digits than its factorization.

66636442609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395487.

The product of its (nonzero) digits is 6718464, while the sum is 52.

The spelling of 66636442609 in words is "sixty-six billion, six hundred thirty-six million, four hundred forty-two thousand, six hundred nine".