666555030 has 48 divisors (see below), whose sum is σ = 1765754640. Its totient is φ = 174393024.

The previous prime is 666555011. The next prime is 666555059. The reversal of 666555030 is 30555666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 65100 + ... + 74639.

It is an arithmetic number, because the mean of its divisors is an integer number (36786555).

Almost surely, 2^666555030 is an apocalyptic number.

666555030 is an abundant number, since it is smaller than the sum of its proper divisors (1099199610).

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

666555030 is a wasteful number, since it uses less digits than its factorization.

666555030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139805 (or 139802 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 666555030 is about 25817.7270494519. The cubic root of 666555030 is about 873.5317002087.

The spelling of 666555030 in words is "six hundred sixty-six million, five hundred fifty-five thousand, thirty".