669866668966 has 16 divisors (see below), whose sum is σ = 1133943578640. Its totient is φ = 293985371680.

The previous prime is 669866668943. The next prime is 669866668967.

669866668966 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 669866668966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669866668967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524973241 + ... + 524974516.

It is an arithmetic number, because the mean of its divisors is an integer number (70871473665).

Almost surely, 2^669866668966 is an apocalyptic number.

669866668966 is a deficient number, since it is larger than the sum of its proper divisors (464076909674).

669866668966 is a wasteful number, since it uses less digits than its factorization.

669866668966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049947799.

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

The spelling of 669866668966 in words is "six hundred sixty-nine billion, eight hundred sixty-six million, six hundred sixty-eight thousand, nine hundred sixty-six".