68222693648209 has 3 divisors (see below), whose sum is σ = 68222701907913. Its totient is φ = 68222685388506.

The previous prime is 68222693648183. The next prime is 68222693648297. The reversal of 68222693648209 is 90284639622286.

The square root of 68222693648209 is 8259703.

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-68222693648209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68222693648299) 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, 4129852 + ... + 12389554.

It is an arithmetic number, because the mean of its divisors is an integer number (22740900635971).

Almost surely, 2^{68222693648209} is an apocalyptic number.

68222693648209 is the 8259703-rd square number.

68222693648209 is the 4129852-nd centered octagonal number.

It is an amenable number.

68222693648209 is a deficient number, since it is larger than the sum of its proper divisors (8259704).

68222693648209 is an frugal number, since it uses more digits than its factorization.

68222693648209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16519406 (or 8259703 counting only the distinct ones).

The product of its (nonzero) digits is 214990848, while the sum is 67.

The spelling of 68222693648209 in words is "sixty-eight trillion, two hundred twenty-two billion, six hundred ninety-three million, six hundred forty-eight thousand, two hundred nine".