669868966 has 32 divisors (see below), whose sum is σ = 1106985600. Its totient is φ = 302140800.

The previous prime is 669868963. The next prime is 669868967.

669868966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669868898 and 669868907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669868963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205840 + ... + 209068.

It is an arithmetic number, because the mean of its divisors is an integer number (34593300).

Almost surely, 2^669868966 is an apocalyptic number.

669868966 is a deficient number, since it is larger than the sum of its proper divisors (437116634).

669868966 is a wasteful number, since it uses less digits than its factorization.

669868966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424.

The product of its digits is 40310784, while the sum is 64.

The square root of 669868966 is about 25881.8269447889. The cubic root of 669868966 is about 874.9769641827.

The spelling of 669868966 in words is "six hundred sixty-nine million, eight hundred sixty-eight thousand, nine hundred sixty-six".