206689012445 has 6 divisors (see below), whose sum is σ = 248028034842. Its totient is φ = 165350396688.

The previous prime is 206689012373. The next prime is 206689012471. The reversal of 206689012445 is 544210986602.

It can be written as a sum of positive squares in 3 ways, for example, as 83164177924 + 123524834521 = 288382^2 + 351461^2 .

It is not a de Polignac number, because 206689012445 - 2¹⁰ = 206689011421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206689012445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 914927 + ... + 1118243.

It is an arithmetic number, because the mean of its divisors is an integer number (41338005807).

Almost surely, 2^206689012445 is an apocalyptic number.

It is an amenable number.

206689012445 is a deficient number, since it is larger than the sum of its proper divisors (41339022397).

206689012445 is an frugal number, since it uses more digits than its factorization.

206689012445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406639 (or 203322 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 206689012445 in words is "two hundred six billion, six hundred eighty-nine million, twelve thousand, four hundred forty-five".