212543686656 has 576 divisors, whose sum is σ = 743518339200. Its totient is φ = 57139789824.

The previous prime is 212543686571. The next prime is 212543686697. The reversal of 212543686656 is 656686345212.

212543686656 is a `hidden beast` number, since 2 + 12 + 543 + 6 + 86 + 6 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679053156 + ... + 679053468.

It is an arithmetic number, because the mean of its divisors is an integer number (1290830450).

Almost surely, 2^212543686656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212543686656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371759169600).

212543686656 is an abundant number, since it is smaller than the sum of its proper divisors (530974652544).

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

212543686656 is a wasteful number, since it uses less digits than its factorization.

212543686656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 621 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 212543686656 in words is "two hundred twelve billion, five hundred forty-three million, six hundred eighty-six thousand, six hundred fifty-six".