669808966 has 8 divisors (see below), whose sum is σ = 1005151104. Its totient is φ = 334758600.

The previous prime is 669808961. The next prime is 669808973.

669808966 is nontrivially palindromic in base 10.

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

It is a self number, because there is not a number n which added to its sum of digits gives 669808966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669808961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67110 + ... + 76441.

It is an arithmetic number, because the mean of its divisors is an integer number (125643888).

Almost surely, 2^669808966 is an apocalyptic number.

669808966 is a deficient number, since it is larger than the sum of its proper divisors (335342138).

669808966 is a wasteful number, since it uses less digits than its factorization.

669808966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145886.

The product of its (nonzero) digits is 6718464, while the sum is 58.

The square root of 669808966 is about 25880.6678043670. The cubic root of 669808966 is about 874.9508395782.

The spelling of 669808966 in words is "six hundred sixty-nine million, eight hundred eight thousand, nine hundred sixty-six".