666863368666 has 8 divisors (see below), whose sum is σ = 1091230966944. Its totient is φ = 303119713020.

The previous prime is 666863368663. The next prime is 666863368673.

666863368666 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 666863368595 and 666863368604.

It is not an unprimeable number, because it can be changed into a prime (666863368663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15155985630 + ... + 15155985673.

It is an arithmetic number, because the mean of its divisors is an integer number (136403870868).

Almost surely, 2^666863368666 is an apocalyptic number.

666863368666 is a deficient number, since it is larger than the sum of its proper divisors (424367598278).

666863368666 is a wasteful number, since it uses less digits than its factorization.

666863368666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30311971316.

The product of its digits is 967458816, while the sum is 70.

The spelling of 666863368666 in words is "six hundred sixty-six billion, eight hundred sixty-three million, three hundred sixty-eight thousand, six hundred sixty-six".