206773006729 has 3 divisors (see below), whose sum is σ = 206773461453. Its totient is φ = 206772552006.

The previous prime is 206773006711. The next prime is 206773006733. The reversal of 206773006729 is 927600377602.

The square root of 206773006729 is 454723.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-206773006729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206773006529) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 227362 + ... + 682084.

It is an arithmetic number, because the mean of its divisors is an integer number (68924487151).

Almost surely, 2^206773006729 is an apocalyptic number.

206773006729 is the 454723-rd square number.

206773006729 is the 227362-nd centered octagonal number.

It is an amenable number.

206773006729 is a deficient number, since it is larger than the sum of its proper divisors (454724).

206773006729 is an frugal number, since it uses more digits than its factorization.

206773006729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909446 (or 454723 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 49.

Multiplying 206773006729 by its sum of digits (49), we get a square (10131877329721 = 3183061²).

The spelling of 206773006729 in words is "two hundred six billion, seven hundred seventy-three million, six thousand, seven hundred twenty-nine".