666600166 has 4 divisors (see below), whose sum is σ = 999900252. Its totient is φ = 333300082.

The previous prime is 666600163. The next prime is 666600167. The reversal of 666600166 is 661006666.

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

It is a super-2 number, since 2×666600166² = 888711562622455112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666600163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166650040 + ... + 166650043.

It is an arithmetic number, because the mean of its divisors is an integer number (249975063).

Almost surely, 2^666600166 is an apocalyptic number.

666600166 is a deficient number, since it is larger than the sum of its proper divisors (333300086).

666600166 is a wasteful number, since it uses less digits than its factorization.

666600166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333300085.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 666600166 is about 25818.6011627276. The cubic root of 666600166 is about 873.5514169288.

The spelling of 666600166 in words is "six hundred sixty-six million, six hundred thousand, one hundred sixty-six".