68359046810209 has 3 divisors (see below), whose sum is σ = 68359055078163. Its totient is φ = 68359038542256.

The previous prime is 68359046810167. The next prime is 68359046810293. The reversal of 68359046810209 is 90201864095386.

The square root of 68359046810209 is 8267953.

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 can be written as a sum of positive squares in only one way, i.e., 60587931630625 + 7771115179584 = 7783825^2 + 2787672^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68359046810209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68359046816209) 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, 4133977 + ... + 12401929.

It is an arithmetic number, because the mean of its divisors is an integer number (22786351692721).

Almost surely, 2^{68359046810209} is an apocalyptic number.

68359046810209 is the 8267953-rd square number.

68359046810209 is the 4133977-th centered octagonal number.

It is an amenable number.

68359046810209 is a deficient number, since it is larger than the sum of its proper divisors (8267954).

68359046810209 is an frugal number, since it uses more digits than its factorization.

68359046810209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16535906 (or 8267953 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 68359046810209 in words is "sixty-eight trillion, three hundred fifty-nine billion, forty-six million, eight hundred ten thousand, two hundred nine".