666600110556 has 24 divisors (see below), whose sum is σ = 1564089649920. Its totient is φ = 220958695152.

The previous prime is 666600110543. The next prime is 666600110567. The reversal of 666600110556 is 655011006666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155165476 + ... + 155169771.

It is an arithmetic number, because the mean of its divisors is an integer number (65170402080).

Almost surely, 2^666600110556 is an apocalyptic number.

It is an amenable number.

666600110556 is an abundant number, since it is smaller than the sum of its proper divisors (897489539364).

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

666600110556 is a wasteful number, since it uses less digits than its factorization.

666600110556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310335433 (or 310335431 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 666600110556 in words is "six hundred sixty-six billion, six hundred million, one hundred ten thousand, five hundred fifty-six".