206139608676 has 81 divisors (see below), whose sum is σ = 538646885049. Its totient is φ = 66469406400.

The previous prime is 206139608671. The next prime is 206139608683. The reversal of 206139608676 is 676806931602.

The square root of 206139608676 is 454026.

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

206139608676 is a `hidden beast` number, since 20 + 6 + 1 + 3 + 9 + 608 + 6 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19930098276 + 186209510400 = 141174^2 + 431520^2 .

It is not an unprimeable number, because it can be changed into a prime (206139608671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 84447616 + ... + 84450056.

Almost surely, 2^206139608676 is an apocalyptic number.

206139608676 is the 454026-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206139608676

206139608676 is an abundant number, since it is smaller than the sum of its proper divisors (332507276373).

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

206139608676 is an equidigital number, since it uses as much as digits as its factorization.

206139608676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 206139608676 in words is "two hundred six billion, one hundred thirty-nine million, six hundred eight thousand, six hundred seventy-six".