6665217772212 has 72 divisors (see below), whose sum is σ = 17081273693120. Its totient is φ = 2191011016320.

The previous prime is 6665217772211. The next prime is 6665217772247. The reversal of 6665217772212 is 2122777125666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665217772211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19909287 + ... + 20241297.

Almost surely, 2^{6665217772212} is an apocalyptic number.

It is an amenable number.

6665217772212 is an abundant number, since it is smaller than the sum of its proper divisors (10416055920908).

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

6665217772212 is a wasteful number, since it uses less digits than its factorization.

6665217772212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339733 (or 339728 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 54.

The spelling of 6665217772212 in words is "six trillion, six hundred sixty-five billion, two hundred seventeen million, seven hundred seventy-two thousand, two hundred twelve".