669863909368966 has 12 divisors (see below), whose sum is σ = 1088033391253692. Its totient is φ = 309167958170136.

The previous prime is 669863909368933. The next prime is 669863909368967.

669863909368966 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669863909368967) 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 5 ways as a sum of consecutive naturals, for example, 990922942516 + ... + 990922943191.

It is an arithmetic number, because the mean of its divisors is an integer number (90669449271141).

Almost surely, 2^{669863909368966} is an apocalyptic number.

669863909368966 is a deficient number, since it is larger than the sum of its proper divisors (418169481884726).

669863909368966 is a wasteful number, since it uses less digits than its factorization.

669863909368966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981845885735 (or 1981845885722 counting only the distinct ones).

The product of its (nonzero) digits is 176319369216, while the sum is 94.

The spelling of 669863909368966 in words is "six hundred sixty-nine trillion, eight hundred sixty-three billion, nine hundred nine million, three hundred sixty-eight thousand, nine hundred sixty-six".