166415666 has 8 divisors (see below), whose sum is σ = 250062384. Its totient is φ = 83061540.

The previous prime is 166415663. The next prime is 166415687. The reversal of 166415666 is 666514661.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166415663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71720 + ... + 74003.

It is an arithmetic number, because the mean of its divisors is an integer number (31257798).

Almost surely, 2^166415666 is an apocalyptic number.

166415666 is a deficient number, since it is larger than the sum of its proper divisors (83646718).

166415666 is a wasteful number, since it uses less digits than its factorization.

166415666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146296.

The product of its digits is 155520, while the sum is 41.

The square root of 166415666 is about 12900.2196105338. The cubic root of 166415666 is about 550.0448073688.

The spelling of 166415666 in words is "one hundred sixty-six million, four hundred fifteen thousand, six hundred sixty-six".