666661166 has 8 divisors (see below), whose sum is σ = 1000246104. Its totient is φ = 333245800.

The previous prime is 666661159. The next prime is 666661201. The reversal of 666661166 is 661166666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×666661166² = 888874220504959112, which contains 22 as substring.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 32060 + ... + 48591.

It is an arithmetic number, because the mean of its divisors is an integer number (125030763).

Almost surely, 2^666661166 is an apocalyptic number.

666661166 is a deficient number, since it is larger than the sum of its proper divisors (333584938).

666661166 is a wasteful number, since it uses less digits than its factorization.

666661166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84786.

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

The square root of 666661166 is about 25819.7824545444. The cubic root of 666661166 is about 873.5780620922.

The spelling of 666661166 in words is "six hundred sixty-six million, six hundred sixty-one thousand, one hundred sixty-six".