16661212 has 6 divisors (see below), whose sum is σ = 29157128. Its totient is φ = 8330604.

The previous prime is 16661147. The next prime is 16661213. The reversal of 16661212 is 21216661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082648 + ... + 2082655.

Almost surely, 2^16661212 is an apocalyptic number.

It is an amenable number.

16661212 is a deficient number, since it is larger than the sum of its proper divisors (12495916).

16661212 is a wasteful number, since it uses less digits than its factorization.

16661212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165307 (or 4165305 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 16661212 is about 4081.8147924667. The cubic root of 16661212 is about 255.4086080071.

Adding to 16661212 its reverse (21216661), we get a palindrome (37877873).

The spelling of 16661212 in words is "sixteen million, six hundred sixty-one thousand, two hundred twelve".