666869968666 has 16 divisors (see below), whose sum is σ = 1093336299648. Its totient is φ = 302540898400.

The previous prime is 666869968643. The next prime is 666869968691.

666869968666 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×666869968666³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666869968666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29079010 + ... + 29101933.

It is an arithmetic number, because the mean of its divisors is an integer number (68333518728).

Almost surely, 2^666869968666 is an apocalyptic number.

666869968666 is a deficient number, since it is larger than the sum of its proper divisors (426466330982).

666869968666 is a wasteful number, since it uses less digits than its factorization.

666869968666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58181477.

The product of its digits is 8707129344, while the sum is 82.

The spelling of 666869968666 in words is "six hundred sixty-six billion, eight hundred sixty-nine million, nine hundred sixty-eight thousand, six hundred sixty-six".