665006212 has 18 divisors (see below), whose sum is σ = 1260168378. Its totient is φ = 306925632.

The previous prime is 665006197. The next prime is 665006219. The reversal of 665006212 is 212600566.

It can be written as a sum of positive squares in 3 ways, for example, as 11999296 + 653006916 = 3464^2 + 25554^2 .

It is not an unprimeable number, because it can be changed into a prime (665006219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 491193 + ... + 492544.

Almost surely, 2^665006212 is an apocalyptic number.

It is an amenable number.

665006212 is a deficient number, since it is larger than the sum of its proper divisors (595162166).

665006212 is a wasteful number, since it uses less digits than its factorization.

665006212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983767 (or 983752 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 665006212 is about 25787.7143616878. The cubic root of 665006212 is about 872.8545913827.

Adding to 665006212 its reverse (212600566), we get a palindrome (877606778).

The spelling of 665006212 in words is "six hundred sixty-five million, six thousand, two hundred twelve".