166220218 has 16 divisors (see below), whose sum is σ = 261014400. Its totient is φ = 79238896.

The previous prime is 166220213. The next prime is 166220251. The reversal of 166220218 is 812022661.

166220218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166220213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8883 + ... + 20281.

It is an arithmetic number, because the mean of its divisors is an integer number (16313400).

Almost surely, 2^166220218 is an apocalyptic number.

166220218 is a deficient number, since it is larger than the sum of its proper divisors (94794182).

166220218 is a wasteful number, since it uses less digits than its factorization.

166220218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11741.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 166220218 is about 12892.6420100769. The cubic root of 166220218 is about 549.8293884036.

Adding to 166220218 its reverse (812022661), we get a palindrome (978242879).

The spelling of 166220218 in words is "one hundred sixty-six million, two hundred twenty thousand, two hundred eighteen".