66616606 has 16 divisors (see below), whose sum is σ = 114342624. Its totient is φ = 28514304.

The previous prime is 66616597. The next prime is 66616609. The reversal of 66616606 is 60661666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616609) 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 7 ways as a sum of consecutive naturals, for example, 10846 + ... + 15838.

It is an arithmetic number, because the mean of its divisors is an integer number (7146414).

Almost surely, 2^66616606 is an apocalyptic number.

66616606 is a deficient number, since it is larger than the sum of its proper divisors (47726018).

66616606 is a wasteful number, since it uses less digits than its factorization.

66616606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5955.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 66616606 is about 8161.8996563300. The cubic root of 66616606 is about 405.3786145947.

It can be divided in two parts, 6661660 and 6, that added together give a palindrome (6661666).

The spelling of 66616606 in words is "sixty-six million, six hundred sixteen thousand, six hundred six".