166891066 has 8 divisors (see below), whose sum is σ = 250742880. Its totient is φ = 83310108.

The previous prime is 166891061. The next prime is 166891069. The reversal of 166891066 is 660198661.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (166891061) 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, 66166 + ... + 68641.

It is an arithmetic number, because the mean of its divisors is an integer number (31342860).

Almost surely, 2^166891066 is an apocalyptic number.

166891066 is a deficient number, since it is larger than the sum of its proper divisors (83851814).

166891066 is a wasteful number, since it uses less digits than its factorization.

166891066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135428.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 166891066 is about 12918.6325127701. The cubic root of 166891066 is about 550.5680808106.

The spelling of 166891066 in words is "one hundred sixty-six million, eight hundred ninety-one thousand, sixty-six".