666676766 has 32 divisors (see below), whose sum is σ = 1185408000. Its totient is φ = 275137632.

The previous prime is 666676741. The next prime is 666676783. The reversal of 666676766 is 667676666.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168155 + ... + 172073.

It is an arithmetic number, because the mean of its divisors is an integer number (37044000).

Almost surely, 2^666676766 is an apocalyptic number.

666676766 is a deficient number, since it is larger than the sum of its proper divisors (518731234).

666676766 is a wasteful number, since it uses less digits than its factorization.

666676766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376.

The product of its digits is 13716864, while the sum is 56.

The square root of 666676766 is about 25820.0845467245. The cubic root of 666676766 is about 873.5848760042.

The spelling of 666676766 in words is "six hundred sixty-six million, six hundred seventy-six thousand, seven hundred sixty-six".