206449370689 has 9 divisors (see below), whose sum is σ = 213338410851. Its totient is φ = 199776082560.

The previous prime is 206449370671. The next prime is 206449370711. The reversal of 206449370689 is 986073944602.

It is a happy number.

The square root of 206449370689 is 454367.

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., 205548890625 + 900480064 = 453375^2 + 30008^2 .

It is not a de Polignac number, because 206449370689 - 2²³ = 206440982081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206449370089) 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, 14078049 + ... + 14092705.

Almost surely, 2^206449370689 is an apocalyptic number.

206449370689 is the 454367-th square number.

206449370689 is the 227184-th centered octagonal number.

It is an amenable number.

206449370689 is a deficient number, since it is larger than the sum of its proper divisors (6889040162).

206449370689 is an frugal number, since it uses more digits than its factorization.

206449370689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29376 (or 14688 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 58.

The spelling of 206449370689 in words is "two hundred six billion, four hundred forty-nine million, three hundred seventy thousand, six hundred eighty-nine".