166706642 has 8 divisors (see below), whose sum is σ = 252397296. Its totient is φ = 82574212.

The previous prime is 166706609. The next prime is 166706647. The reversal of 166706642 is 246607661.

166706642 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 2×166706642² = 55582208973832328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166706596 and 166706605.

It is not an unprimeable number, because it can be changed into a prime (166706647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389288 + ... + 389715.

It is an arithmetic number, because the mean of its divisors is an integer number (31549662).

Almost surely, 2^166706642 is an apocalyptic number.

166706642 is a deficient number, since it is larger than the sum of its proper divisors (85690654).

166706642 is a wasteful number, since it uses less digits than its factorization.

166706642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779112.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 166706642 is about 12911.4926325348. The cubic root of 166706642 is about 550.3652031793.

The spelling of 166706642 in words is "one hundred sixty-six million, seven hundred six thousand, six hundred forty-two".