166616666 has 8 divisors (see below), whose sum is σ = 250005504. Its totient is φ = 83281500.

The previous prime is 166616663. The next prime is 166616689. The reversal of 166616666 is 666616661.

166616666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×166616666² = 55522226777911112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166616663) 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 in 3 ways as a sum of consecutive naturals, for example, 4460 + ... + 18791.

It is an arithmetic number, because the mean of its divisors is an integer number (31250688).

Almost surely, 2^166616666 is an apocalyptic number.

166616666 is a deficient number, since it is larger than the sum of its proper divisors (83388838).

166616666 is a wasteful number, since it uses less digits than its factorization.

166616666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26836.

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

The square root of 166616666 is about 12908.0078246025. The cubic root of 166616666 is about 550.2661697903.

The spelling of 166616666 in words is "one hundred sixty-six million, six hundred sixteen thousand, six hundred sixty-six".