666116666 has 16 divisors (see below), whose sum is σ = 1012259808. Its totient is φ = 328705200.

The previous prime is 666116641. The next prime is 666116683. The reversal of 666116666 is 666611666.

It is a super-2 number, since 2×666116666² = 887422825445911112, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 10.

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, 252836 + ... + 255456.

It is an arithmetic number, because the mean of its divisors is an integer number (63266238).

Almost surely, 2^666116666 is an apocalyptic number.

666116666 is a deficient number, since it is larger than the sum of its proper divisors (346143142).

666116666 is a wasteful number, since it uses less digits than its factorization.

666116666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237.

The product of its digits is 279936, while the sum is 44.

The square root of 666116666 is about 25809.2360599844. The cubic root of 666116666 is about 873.3401637223.

The spelling of 666116666 in words is "six hundred sixty-six million, one hundred sixteen thousand, six hundred sixty-six".