669349943966 has 16 divisors (see below), whose sum is σ = 1105348535280. Its totient is φ = 301458689280.

The previous prime is 669349943881. The next prime is 669349943993.

669349943966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669349943893 and 669349943902.

It is a congruent number.

It is an unprimeable number.

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, 139561811 + ... + 139566606.

It is an arithmetic number, because the mean of its divisors is an integer number (69084283455).

Almost surely, 2^669349943966 is an apocalyptic number.

669349943966 is a deficient number, since it is larger than the sum of its proper divisors (435998591314).

669349943966 is a wasteful number, since it uses less digits than its factorization.

669349943966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279128539.

The product of its digits is 1224440064, while the sum is 74.

The spelling of 669349943966 in words is "six hundred sixty-nine billion, three hundred forty-nine million, nine hundred forty-three thousand, nine hundred sixty-six".