66668606 has 8 divisors (see below), whose sum is σ = 105266280. Its totient is φ = 31579848.

The previous prime is 66668603. The next prime is 66668621. The reversal of 66668606 is 60686666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877181 + ... + 877256.

It is an arithmetic number, because the mean of its divisors is an integer number (13158285).

Almost surely, 2^66668606 is an apocalyptic number.

66668606 is a deficient number, since it is larger than the sum of its proper divisors (38597674).

66668606 is a wasteful number, since it uses less digits than its factorization.

66668606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754458.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 66668606 is about 8165.0845678413. The cubic root of 66668606 is about 405.4840648058.

The spelling of 66668606 in words is "sixty-six million, six hundred sixty-eight thousand, six hundred six".