666151220 has 24 divisors (see below), whose sum is σ = 1598763264. Its totient is φ = 228394656.

The previous prime is 666151177. The next prime is 666151237. The reversal of 666151220 is 22151666.

666151220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2378972 + ... + 2379251.

It is an arithmetic number, because the mean of its divisors is an integer number (66615136).

Almost surely, 2^666151220 is an apocalyptic number.

It is an amenable number.

666151220 is an abundant number, since it is smaller than the sum of its proper divisors (932612044).

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

666151220 is a wasteful number, since it uses less digits than its factorization.

666151220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4758239 (or 4758237 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 666151220 is about 25809.9054628257. The cubic root of 666151220 is about 873.3552646177.

The spelling of 666151220 in words is "six hundred sixty-six million, one hundred fifty-one thousand, two hundred twenty".