6661333212 has 12 divisors (see below), whose sum is σ = 15543110856. Its totient is φ = 2220444400.

The previous prime is 6661333199. The next prime is 6661333213. The reversal of 6661333212 is 2123331666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×6661333212² = 88746720322588473888, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661333213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277555539 + ... + 277555562.

It is an arithmetic number, because the mean of its divisors is an integer number (1295259238).

Almost surely, 2^6661333212 is an apocalyptic number.

It is an amenable number.

6661333212 is an abundant number, since it is smaller than the sum of its proper divisors (8881777644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661333212 is a wasteful number, since it uses less digits than its factorization.

6661333212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555111108 (or 555111106 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 6661333212 is about 81616.9909516395. The cubic root of 6661333212 is about 1881.5700265602.

Adding to 6661333212 its reverse (2123331666), we get a palindrome (8784664878).

The spelling of 6661333212 in words is "six billion, six hundred sixty-one million, three hundred thirty-three thousand, two hundred twelve".