669767966 has 48 divisors (see below), whose sum is σ = 1190521152. Its totient is φ = 281736000.

The previous prime is 669767953. The next prime is 669767971.

It is a happy number.

669767966 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669767899 and 669767908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1553771 + ... + 1554201.

It is an arithmetic number, because the mean of its divisors is an integer number (24802524).

Almost surely, 2^669767966 is an apocalyptic number.

669767966 is a deficient number, since it is larger than the sum of its proper divisors (520753186).

669767966 is a wasteful number, since it uses less digits than its factorization.

669767966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 698 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 62.

The square root of 669767966 is about 25879.8756952192. The cubic root of 669767966 is about 874.9329868678.

The spelling of 669767966 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, nine hundred sixty-six".