206532982681 has 9 divisors (see below), whose sum is σ = 213914040223. Its totient is φ = 199398430840.

The previous prime is 206532982673. The next prime is 206532982709. The reversal of 206532982681 is 186289235602.

The square root of 206532982681 is 454459.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 108300886281 + 98232096400 = 329091^2 + 313420^2 .

It is not a de Polignac number, because 206532982681 - 2³ = 206532982673 is a prime.

It is a super-2 number, since 2×206532982681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206532982781) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13171476 + ... + 13187146.

Almost surely, 2^206532982681 is an apocalyptic number.

206532982681 is the 454459-th square number.

206532982681 is the 227230-th centered octagonal number.

It is an amenable number.

206532982681 is a deficient number, since it is larger than the sum of its proper divisors (7381057542).

206532982681 is an frugal number, since it uses more digits than its factorization.

206532982681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31400 (or 15700 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 206532982681 in words is "two hundred six billion, five hundred thirty-two million, nine hundred eighty-two thousand, six hundred eighty-one".