666706670688 has 48 divisors (see below), whose sum is σ = 1759882178880. Its totient is φ = 220994011776.

The previous prime is 666706670683. The next prime is 666706670863. The reversal of 666706670688 is 886076607666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666706670683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19381870 + ... + 19416237.

It is an arithmetic number, because the mean of its divisors is an integer number (36664212060).

Almost surely, 2^666706670688 is an apocalyptic number.

It is an amenable number.

666706670688 is an abundant number, since it is smaller than the sum of its proper divisors (1093175508192).

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

666706670688 is a wasteful number, since it uses less digits than its factorization.

666706670688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38798299 (or 38798291 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 66.

The spelling of 666706670688 in words is "six hundred sixty-six billion, seven hundred six million, six hundred seventy thousand, six hundred eighty-eight".