660220066 has 16 divisors (see below), whose sum is σ = 1081291680. Its totient is φ = 299841280.

The previous prime is 660220063. The next prime is 660220079. The reversal of 660220066 is 660022066.

It is not an unprimeable number, because it can be changed into a prime (660220063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14445 + ... + 39103.

It is an arithmetic number, because the mean of its divisors is an integer number (67580730).

Almost surely, 2^660220066 is an apocalyptic number.

660220066 is a deficient number, since it is larger than the sum of its proper divisors (421071614).

660220066 is a wasteful number, since it uses less digits than its factorization.

660220066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25889.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 660220066 is about 25694.7478290798. The cubic root of 660220066 is about 870.7555272492.

The spelling of 660220066 in words is "six hundred sixty million, two hundred twenty thousand, sixty-six".