669516644 has 12 divisors (see below), whose sum is σ = 1240575084. Its totient is φ = 315066624.

The previous prime is 669516643. The next prime is 669516697. The reversal of 669516644 is 446615966.

It can be written as a sum of positive squares in 2 ways, for example, as 214974244 + 454542400 = 14662^2 + 21320^2 .

It is not an unprimeable number, because it can be changed into a prime (669516643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4922849 + ... + 4922984.

It is an arithmetic number, because the mean of its divisors is an integer number (103381257).

Almost surely, 2^669516644 is an apocalyptic number.

It is an amenable number.

669516644 is a deficient number, since it is larger than the sum of its proper divisors (571058440).

669516644 is a wasteful number, since it uses less digits than its factorization.

669516644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9845854 (or 9845852 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 669516644 is about 25875.0196908138. The cubic root of 669516644 is about 874.8235373128.

The spelling of 669516644 in words is "six hundred sixty-nine million, five hundred sixteen thousand, six hundred forty-four".