666666740766 has 24 divisors (see below), whose sum is σ = 1443787144920. Its totient is φ = 205128227616.

The previous prime is 666666740731. The next prime is 666666740767. The reversal of 666666740766 is 667047666666.

It is a super-2 number, since 2×666666740766² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666666740697 and 666666740706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666740767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328730121 + ... + 328732148.

It is an arithmetic number, because the mean of its divisors is an integer number (60157797705).

Almost surely, 2^666666740766 is an apocalyptic number.

666666740766 is an abundant number, since it is smaller than the sum of its proper divisors (777120404154).

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

666666740766 is a wasteful number, since it uses less digits than its factorization.

666666740766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657462300 (or 657462287 counting only the distinct ones).

The product of its (nonzero) digits is 329204736, while the sum is 66.

The spelling of 666666740766 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred sixty-six".