166216786 has 16 divisors (see below), whose sum is σ = 264436704. Its totient is φ = 78087744.

The previous prime is 166216783. The next prime is 166216847. The reversal of 166216786 is 687612661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166216783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18061 + ... + 25663.

It is an arithmetic number, because the mean of its divisors is an integer number (16527294).

Almost surely, 2^166216786 is an apocalyptic number.

166216786 is a deficient number, since it is larger than the sum of its proper divisors (98219918).

166216786 is a wasteful number, since it uses less digits than its factorization.

166216786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265.

The product of its digits is 145152, while the sum is 43.

The square root of 166216786 is about 12892.5089102160. The cubic root of 166216786 is about 549.8256042120.

The spelling of 166216786 in words is "one hundred sixty-six million, two hundred sixteen thousand, seven hundred eighty-six".