166006220 has 24 divisors (see below), whose sum is σ = 351875664. Its totient is φ = 65781056.

The previous prime is 166006219. The next prime is 166006223. The reversal of 166006220 is 22600661.

166006220 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 (166006223) 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, 36647 + ... + 40926.

It is an arithmetic number, because the mean of its divisors is an integer number (14661486).

Almost surely, 2^166006220 is an apocalyptic number.

166006220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166006220 is an abundant number, since it is smaller than the sum of its proper divisors (185869444).

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

166006220 is a wasteful number, since it uses less digits than its factorization.

166006220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77689 (or 77687 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 166006220 is about 12884.3401072775. The cubic root of 166006220 is about 549.5933302367.

Adding to 166006220 its reverse (22600661), we get a palindrome (188606881).

The spelling of 166006220 in words is "one hundred sixty-six million, six thousand, two hundred twenty".