220640166 has 32 divisors (see below), whose sum is σ = 499569120. Its totient is φ = 72158112.

The previous prime is 220640159. The next prime is 220640171. The reversal of 220640166 is 661046022.

It is a happy number.

220640166 is a `hidden beast` number, since 2 + 2 + 0 + 640 + 16 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35685 + ... + 41408.

It is an arithmetic number, because the mean of its divisors is an integer number (15611535).

Almost surely, 2^220640166 is an apocalyptic number.

220640166 is an abundant number, since it is smaller than the sum of its proper divisors (278928954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220640166 is a wasteful number, since it uses less digits than its factorization.

220640166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77157 (or 77151 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 220640166 is about 14853.9612898378. The cubic root of 220640166 is about 604.2660461957.

Adding to 220640166 its reverse (661046022), we get a palindrome (881686188).

The spelling of 220640166 in words is "two hundred twenty million, six hundred forty thousand, one hundred sixty-six".