666628180 has 24 divisors (see below), whose sum is σ = 1400555520. Its totient is φ = 266530080.

The previous prime is 666628141. The next prime is 666628187. The reversal of 666628180 is 81826666.

It is a super-2 number, since 2×666628180² = 888786260740224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666628187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47181 + ... + 59659.

It is an arithmetic number, because the mean of its divisors is an integer number (58356480).

Almost surely, 2^666628180 is an apocalyptic number.

It is an amenable number.

666628180 is an abundant number, since it is smaller than the sum of its proper divisors (733927340).

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

666628180 is a wasteful number, since it uses less digits than its factorization.

666628180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15159 (or 15157 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 666628180 is about 25819.1436728641. The cubic root of 666628180 is about 873.5636538127.

The spelling of 666628180 in words is "six hundred sixty-six million, six hundred twenty-eight thousand, one hundred eighty".