66668066 has 4 divisors (see below), whose sum is σ = 100002102. Its totient is φ = 33334032.

The previous prime is 66668051. The next prime is 66668143. The reversal of 66668066 is 66086666.

It is a happy number.

66668066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 841 = 8165^2 + 29^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16667015 + ... + 16667018.

Almost surely, 2^66668066 is an apocalyptic number.

66668066 is a deficient number, since it is larger than the sum of its proper divisors (33334036).

66668066 is a wasteful number, since it uses less digits than its factorization.

66668066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33334035.

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

The square root of 66668066 is about 8165.0515001438. The cubic root of 66668066 is about 405.4829700277.

The spelling of 66668066 in words is "sixty-six million, six hundred sixty-eight thousand, sixty-six".