166681683 has 18 divisors (see below), whose sum is σ = 280071324. Its totient is φ = 95246424.

The previous prime is 166681643. The next prime is 166681709. The reversal of 166681683 is 386186661.

It is not a de Polignac number, because 166681683 - 2⁹ = 166681171 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (166681643) 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 17 ways as a sum of consecutive naturals, for example, 188541 + ... + 189422.

It is an arithmetic number, because the mean of its divisors is an integer number (15559518).

Almost surely, 2^166681683 is an apocalyptic number.

166681683 is a deficient number, since it is larger than the sum of its proper divisors (113389641).

166681683 is a wasteful number, since it uses less digits than its factorization.

166681683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377983 (or 377973 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 166681683 is about 12910.5260543481. The cubic root of 166681683 is about 550.3377352662.

The spelling of 166681683 in words is "one hundred sixty-six million, six hundred eighty-one thousand, six hundred eighty-three".