211706066 has 32 divisors (see below), whose sum is σ = 395031168. Its totient is φ = 83600640.

The previous prime is 211706057. The next prime is 211706069. The reversal of 211706066 is 660607112.

It is not an unprimeable number, because it can be changed into a prime (211706069) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16910 + ... + 26633.

It is an arithmetic number, because the mean of its divisors is an integer number (12344724).

Almost surely, 2^211706066 is an apocalyptic number.

211706066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

211706066 is a deficient number, since it is larger than the sum of its proper divisors (183325102).

211706066 is a wasteful number, since it uses less digits than its factorization.

211706066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43586.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 211706066 is about 14550.1225424393. The cubic root of 211706066 is about 595.9974944717.

The spelling of 211706066 in words is "two hundred eleven million, seven hundred six thousand, sixty-six".