212215663656 has 48 divisors (see below), whose sum is σ = 588117060960. Its totient is φ = 69093470880.

The previous prime is 212215663637. The next prime is 212215663657. The reversal of 212215663656 is 656366512212.

212215663656 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 5 + 6 + 636 + 5 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (212215663657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34269460 + ... + 34275651.

It is an arithmetic number, because the mean of its divisors is an integer number (12252438770).

Almost surely, 2^212215663656 is an apocalyptic number.

It is an amenable number.

212215663656 is an abundant number, since it is smaller than the sum of its proper divisors (375901397304).

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

212215663656 is a wasteful number, since it uses less digits than its factorization.

212215663656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68545166 (or 68545159 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

It can be divided in two parts, 2122156 and 63656, that added together give a palindrome (2185812).

The spelling of 212215663656 in words is "two hundred twelve billion, two hundred fifteen million, six hundred sixty-three thousand, six hundred fifty-six".