666931865212 has 12 divisors (see below), whose sum is σ = 1167189269400. Its totient is φ = 333449216816.

The previous prime is 666931865087. The next prime is 666931865267. The reversal of 666931865212 is 212568139666.

666931865212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666931865212² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4088962 + ... + 4248937.

It is an arithmetic number, because the mean of its divisors is an integer number (97265772450).

Almost surely, 2^666931865212 is an apocalyptic number.

It is an amenable number.

666931865212 is a deficient number, since it is larger than the sum of its proper divisors (500257404188).

666931865212 is a wasteful number, since it uses less digits than its factorization.

666931865212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8357900 (or 8357898 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 55.

The spelling of 666931865212 in words is "six hundred sixty-six billion, nine hundred thirty-one million, eight hundred sixty-five thousand, two hundred twelve".