68205206389 has 4 divisors (see below), whose sum is σ = 68205733056. Its totient is φ = 68204679724.

The previous prime is 68205206351. The next prime is 68205206393. The reversal of 68205206389 is 98360250286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68205206389 - 2⁹ = 68205205877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68205206309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81042 + ... + 378124.

It is an arithmetic number, because the mean of its divisors is an integer number (17051433264).

Almost surely, 2^68205206389 is an apocalyptic number.

It is an amenable number.

68205206389 is a deficient number, since it is larger than the sum of its proper divisors (526667).

68205206389 is a wasteful number, since it uses less digits than its factorization.

68205206389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526666.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 68205206389 in words is "sixty-eight billion, two hundred five million, two hundred six thousand, three hundred eighty-nine".