66666066 has 16 divisors (see below), whose sum is σ = 134132544. Its totient is φ = 22088624.

The previous prime is 66666059. The next prime is 66666071. The reversal of 66666066 is 66066666.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32265 + ... + 34268.

It is an arithmetic number, because the mean of its divisors is an integer number (8383284).

Almost surely, 2^66666066 is an apocalyptic number.

66666066 is an abundant number, since it is smaller than the sum of its proper divisors (67466478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66666066 is a wasteful number, since it uses less digits than its factorization.

66666066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66705.

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 66666066 is about 8164.9290260234. The cubic root of 66666066 is about 405.4789152426.

The spelling of 66666066 in words is "sixty-six million, six hundred sixty-six thousand, sixty-six".