669618212 has 12 divisors (see below), whose sum is σ = 1196764800. Its totient is φ = 327685416.

The previous prime is 669618161. The next prime is 669618217. The reversal of 669618212 is 212816966.

It is a happy number.

It is a super-3 number, since 3×669618212³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669618212.

It is not an unprimeable number, because it can be changed into a prime (669618217) 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, 1780712 + ... + 1781087.

It is an arithmetic number, because the mean of its divisors is an integer number (99730400).

Almost surely, 2^669618212 is an apocalyptic number.

It is an amenable number.

669618212 is a deficient number, since it is larger than the sum of its proper divisors (527146588).

669618212 is a wasteful number, since it uses less digits than its factorization.

669618212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561850 (or 3561848 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 669618212 is about 25876.9822815567. The cubic root of 669618212 is about 874.8677729989.

The spelling of 669618212 in words is "six hundred sixty-nine million, six hundred eighteen thousand, two hundred twelve".