166693213 has 16 divisors (see below), whose sum is σ = 184204800. Its totient is φ = 150139440.

The previous prime is 166693207. The next prime is 166693271. The reversal of 166693213 is 312396661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166693213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166693273) 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 15 ways as a sum of consecutive naturals, for example, 77158 + ... + 79288.

It is an arithmetic number, because the mean of its divisors is an integer number (11512800).

Almost surely, 2^166693213 is an apocalyptic number.

It is an amenable number.

166693213 is a deficient number, since it is larger than the sum of its proper divisors (17511587).

166693213 is a wasteful number, since it uses less digits than its factorization.

166693213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352.

The product of its digits is 34992, while the sum is 37.

The square root of 166693213 is about 12910.9725814905. The cubic root of 166693213 is about 550.3504246184.

The spelling of 166693213 in words is "one hundred sixty-six million, six hundred ninety-three thousand, two hundred thirteen".