6665533212 has 24 divisors (see below), whose sum is σ = 16749288976. Its totient is φ = 2050933248.

The previous prime is 6665533211. The next prime is 6665533249. The reversal of 6665533212 is 2123355666.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665533211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21363733 + ... + 21364044.

Almost surely, 2^6665533212 is an apocalyptic number.

It is an amenable number.

6665533212 is an abundant number, since it is smaller than the sum of its proper divisors (10083755764).

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

6665533212 is a wasteful number, since it uses less digits than its factorization.

6665533212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42727797 (or 42727795 counting only the distinct ones).

The product of its digits is 194400, while the sum is 39.

The square root of 6665533212 is about 81642.7168337752. The cubic root of 6665533212 is about 1881.9653895488.

Adding to 6665533212 its reverse (2123355666), we get a palindrome (8788888878).

The spelling of 6665533212 in words is "six billion, six hundred sixty-five million, five hundred thirty-three thousand, two hundred twelve".