666550616610 has 48 divisors (see below), whose sum is σ = 1644125829696. Its totient is φ = 172942852032.

The previous prime is 666550616591. The next prime is 666550616687. The reversal of 666550616610 is 16616055666.

It is a self number, because there is not a number n which added to its sum of digits gives 666550616610.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8073742 + ... + 8155881.

It is an arithmetic number, because the mean of its divisors is an integer number (34252621452).

Almost surely, 2^666550616610 is an apocalyptic number.

666550616610 is an abundant number, since it is smaller than the sum of its proper divisors (977575213086).

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

666550616610 is a wasteful number, since it uses less digits than its factorization.

666550616610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16229707 (or 16229670 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 666550616610 in words is "six hundred sixty-six billion, five hundred fifty million, six hundred sixteen thousand, six hundred ten".