68006666 has 32 divisors (see below), whose sum is σ = 128956800. Its totient is φ = 26174016.

The previous prime is 68006657. The next prime is 68006669. The reversal of 68006666 is 66660086.

It is not an unprimeable number, because it can be changed into a prime (68006669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (4029900).

Almost surely, 2^68006666 is an apocalyptic number.

68006666 is a deficient number, since it is larger than the sum of its proper divisors (60950134).

68006666 is a wasteful number, since it uses less digits than its factorization.

68006666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10158.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 68006666 is about 8246.6154269494. The cubic root of 68006666 is about 408.1788471642.

The spelling of 68006666 in words is "sixty-eight million, six thousand, six hundred sixty-six".