206543021213556 has 48 divisors (see below), whose sum is σ = 535652606455680. Its totient is φ = 68825726645760.

The previous prime is 206543021213537. The next prime is 206543021213597. The reversal of 206543021213556 is 655312120345602.

206543021213556 is a `hidden beast` number, since 2 + 0 + 6 + 54 + 3 + 0 + 21 + 21 + 3 + 556 = 666.

It is a super-3 number, since 3×206543021213556³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304480360 + ... + 305157951.

It is an arithmetic number, because the mean of its divisors is an integer number (11159429301160).

Almost surely, 2^{206543021213556} is an apocalyptic number.

It is an amenable number.

206543021213556 is an abundant number, since it is smaller than the sum of its proper divisors (329109585242124).

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

206543021213556 is a wasteful number, since it uses less digits than its factorization.

206543021213556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609641461 (or 609641453 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 206543021213556 in words is "two hundred six trillion, five hundred forty-three billion, twenty-one million, two hundred thirteen thousand, five hundred fifty-six".