666616856116 has 12 divisors (see below), whose sum is σ = 1175094677988. Its totient is φ = 330875519552.

The previous prime is 666616856111. The next prime is 666616856159. The reversal of 666616856116 is 611658616666.

It can be written as a sum of positive squares in 2 ways, for example, as 430790071716 + 235826784400 = 656346^2 + 485620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666616856111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608226511 + ... + 608227606.

It is an arithmetic number, because the mean of its divisors is an integer number (97924556499).

Almost surely, 2^666616856116 is an apocalyptic number.

It is an amenable number.

666616856116 is a deficient number, since it is larger than the sum of its proper divisors (508477821872).

666616856116 is a wasteful number, since it uses less digits than its factorization.

666616856116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216454258 (or 1216454256 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 58.

The spelling of 666616856116 in words is "six hundred sixty-six billion, six hundred sixteen million, eight hundred fifty-six thousand, one hundred sixteen".