666968000869666 has 8 divisors (see below), whose sum is σ = 1000452736981404. Its totient is φ = 333483755209200.

The previous prime is 666968000869633. The next prime is 666968000869673.

666968000869666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 658993617898641 + 7974382971025 = 25670871^2 + 2823895^2 .

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

It is a super-2 number, since 2×666968000869666² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666968000869666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119193985 + ... + 124664116.

Almost surely, 2^{666968000869666} is an apocalyptic number.

666968000869666 is a deficient number, since it is larger than the sum of its proper divisors (333484736111738).

666968000869666 is a wasteful number, since it uses less digits than its factorization.

666968000869666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245225636.

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

The spelling of 666968000869666 in words is "six hundred sixty-six trillion, nine hundred sixty-eight billion, eight hundred sixty-nine thousand, six hundred sixty-six".