166681266 has 8 divisors (see below), whose sum is σ = 333362544. Its totient is φ = 55560420.

The previous prime is 166681259. The next prime is 166681267. The reversal of 166681266 is 662186661.

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

166681266 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (166681267) 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, 13890100 + ... + 13890111.

It is an arithmetic number, because the mean of its divisors is an integer number (41670318).

Almost surely, 2^166681266 is an apocalyptic number.

166681266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166681266 is a wasteful number, since it uses less digits than its factorization.

166681266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780216.

The product of its digits is 124416, while the sum is 42.

The square root of 166681266 is about 12910.5099047249. The cubic root of 166681266 is about 550.3372763255.

The spelling of 166681266 in words is "one hundred sixty-six million, six hundred eighty-one thousand, two hundred sixty-six".