166390694 has 16 divisors (see below), whose sum is σ = 260720640. Its totient is φ = 79491720.

The previous prime is 166390687. The next prime is 166390711. The reversal of 166390694 is 496093661.

166390694 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 66437 + ... + 68895.

It is an arithmetic number, because the mean of its divisors is an integer number (16295040).

Almost surely, 2^166390694 is an apocalyptic number.

166390694 is a deficient number, since it is larger than the sum of its proper divisors (94329946).

166390694 is a wasteful number, since it uses less digits than its factorization.

166390694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 166390694 is about 12899.2516837218. The cubic root of 166390694 is about 550.0172931202.

The spelling of 166390694 in words is "one hundred sixty-six million, three hundred ninety thousand, six hundred ninety-four".