166213071 has 12 divisors (see below), whose sum is σ = 240210672. Its totient is φ = 110750976.

The previous prime is 166213049. The next prime is 166213081. The reversal of 166213071 is 170312661.

166213071 is a `hidden beast` number, since 1 + 6 + 621 + 30 + 7 + 1 = 666.

It is not a de Polignac number, because 166213071 - 2⁵ = 166213039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166213031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20335 + ... + 27311.

It is an arithmetic number, because the mean of its divisors is an integer number (20017556).

Almost surely, 2^166213071 is an apocalyptic number.

166213071 is a deficient number, since it is larger than the sum of its proper divisors (73997601).

166213071 is a wasteful number, since it uses less digits than its factorization.

166213071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9630 (or 9627 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 166213071 is about 12892.3648334974. The cubic root of 166213071 is about 549.8215079203.

The spelling of 166213071 in words is "one hundred sixty-six million, two hundred thirteen thousand, seventy-one".