66666666606 has 64 divisors (see below), whose sum is σ = 140637482496.
Its totient is φ = 21026192000.
The previous prime is 66666666589. The next prime is 66666666643. The reversal of 66666666606 is 60666666666.
Adding to 66666666606 its sum of digits (60), we get a palindrome (66666666666).
It can be divided in two parts, 6666666660 and 6, that added together give a palindrome (6666666666).
It is a self number, because there is not a number n which added to its sum of digits gives 66666666606.
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 31 ways as a sum of consecutive naturals, for example, 26913040 + ... + 26915516.
It is an arithmetic number, because the mean of its divisors is an integer number (2197460664).
Almost surely, 266666666606 is an apocalyptic number.
66666666606 is an abundant number, since it is smaller than the sum of its proper divisors (73970815890).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66666666606 is a wasteful number, since it uses less digits than its factorization.
66666666606 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4537.
The product of its (nonzero) digits is 60466176, while the sum is 60.
The spelling of 66666666606 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred six".