166211918 has 8 divisors (see below), whose sum is σ = 256056312. Its totient is φ = 80859816.

The previous prime is 166211887. The next prime is 166211939. The reversal of 166211918 is 819112661.

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

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122980 + ... + 1123127.

It is an arithmetic number, because the mean of its divisors is an integer number (32007039).

Almost surely, 2^166211918 is an apocalyptic number.

166211918 is a deficient number, since it is larger than the sum of its proper divisors (89844394).

166211918 is a wasteful number, since it uses less digits than its factorization.

166211918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246146.

The product of its digits is 5184, while the sum is 35.

The square root of 166211918 is about 12892.3201170309. The cubic root of 166211918 is about 549.8202365689.

The spelling of 166211918 in words is "one hundred sixty-six million, two hundred eleven thousand, nine hundred eighteen".