666616366 has 32 divisors (see below), whose sum is σ = 1097903520. Its totient is φ = 301694976.

The previous prime is 666616361. The next prime is 666616367. The reversal of 666616366 is 663616666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666616361) 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 15 ways as a sum of consecutive naturals, for example, 446950 + ... + 448438.

It is an arithmetic number, because the mean of its divisors is an integer number (34309485).

Almost surely, 2^666616366 is an apocalyptic number.

666616366 is a deficient number, since it is larger than the sum of its proper divisors (431287154).

666616366 is a wasteful number, since it uses less digits than its factorization.

666616366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its digits is 839808, while the sum is 46.

The square root of 666616366 is about 25818.9148881203. The cubic root of 666616366 is about 873.5584933438.

It can be divided in two parts, 6666 and 16366, that added together give a palindrome (23032).

The spelling of 666616366 in words is "six hundred sixty-six million, six hundred sixteen thousand, three hundred sixty-six".