66806246009 has 24 divisors (see below), whose sum is σ = 74746296960. Its totient is φ = 59532109056.

The previous prime is 66806245939. The next prime is 66806246011. The reversal of 66806246009 is 90064260866.

It is not a de Polignac number, because 66806246009 - 2¹² = 66806241913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66806246099) 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 23 ways as a sum of consecutive naturals, for example, 15191399 + ... + 15195795.

It is an arithmetic number, because the mean of its divisors is an integer number (3114429040).

Almost surely, 2^66806246009 is an apocalyptic number.

It is an amenable number.

66806246009 is a deficient number, since it is larger than the sum of its proper divisors (7940050951).

66806246009 is a wasteful number, since it uses less digits than its factorization.

66806246009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7217 (or 7200 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 66806246009 in words is "sixty-six billion, eight hundred six million, two hundred forty-six thousand, nine".