666666666672 has 40 divisors (see below), whose sum is σ = 1723255555776. Its totient is φ = 222088888896.

The previous prime is 666666666671. The next prime is 666666666733. The reversal of 666666666672 is 276666666666.

It is a junction number, because it is equal to n+sod(n) for n = 666666666597 and 666666666606.

It is not an unprimeable number, because it can be changed into a prime (666666666671) 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, 4085818 + ... + 4245849.

Almost surely, 2^666666666672 is an apocalyptic number.

It is an amenable number.

666666666672 is an abundant number, since it is smaller than the sum of its proper divisors (1056588889104).

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

666666666672 is a wasteful number, since it uses less digits than its factorization.

666666666672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333345 (or 8333339 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 69.

The spelling of 666666666672 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-two".