669686966 has 16 divisors (see below), whose sum is σ = 1119106800. Its totient is φ = 298427808.

The previous prime is 669686957. The next prime is 669686987.

669686966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669686899 and 669686908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443336 + ... + 444843.

It is an arithmetic number, because the mean of its divisors is an integer number (69944175).

Almost surely, 2^669686966 is an apocalyptic number.

669686966 is a deficient number, since it is larger than the sum of its proper divisors (449419834).

669686966 is a wasteful number, since it uses less digits than its factorization.

669686966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888223.

The product of its digits is 30233088, while the sum is 62.

The square root of 669686966 is about 25878.3107253932. The cubic root of 669686966 is about 874.8977147375.

The spelling of 669686966 in words is "six hundred sixty-nine million, six hundred eighty-six thousand, nine hundred sixty-six".