666676666 has 32 divisors (see below), whose sum is σ = 1065369600. Its totient is φ = 312220656.

The previous prime is 666676663. The next prime is 666676697.

666676666 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666676663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612775 + ... + 613861.

It is an arithmetic number, because the mean of its divisors is an integer number (33292800).

Almost surely, 2^666676666 is an apocalyptic number.

666676666 is a deficient number, since it is larger than the sum of its proper divisors (398692934).

666676666 is a wasteful number, since it uses less digits than its factorization.

666676666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its digits is 11757312, while the sum is 55.

The square root of 666676666 is about 25820.0826102474. The cubic root of 666676666 is about 873.5848323256.

The spelling of 666676666 in words is "six hundred sixty-six million, six hundred seventy-six thousand, six hundred sixty-six".