66147322685 has 16 divisors (see below), whose sum is σ = 80345877696. Its totient is φ = 52272000768.

The previous prime is 66147322667. The next prime is 66147322753. The reversal of 66147322685 is 58622374166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66147322685 - 2²⁰ = 66146274109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4967957 + ... + 4981253.

It is an arithmetic number, because the mean of its divisors is an integer number (5021617356).

Almost surely, 2^66147322685 is an apocalyptic number.

It is an amenable number.

66147322685 is a deficient number, since it is larger than the sum of its proper divisors (14198555011).

66147322685 is a wasteful number, since it uses less digits than its factorization.

66147322685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25372.

The product of its digits is 2903040, while the sum is 50.

The spelling of 66147322685 in words is "sixty-six billion, one hundred forty-seven million, three hundred twenty-two thousand, six hundred eighty-five".