68197316939 has 4 divisors (see below), whose sum is σ = 68237505624. Its totient is φ = 68157128256.

The previous prime is 68197316879. The next prime is 68197316959. The reversal of 68197316939 is 93961379186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68197316939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68197316959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20091797 + ... + 20095190.

It is an arithmetic number, because the mean of its divisors is an integer number (17059376406).

Almost surely, 2^68197316939 is an apocalyptic number.

68197316939 is a deficient number, since it is larger than the sum of its proper divisors (40188685).

68197316939 is a wasteful number, since it uses less digits than its factorization.

68197316939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40188684.

The product of its digits is 13226976, while the sum is 62.

The spelling of 68197316939 in words is "sixty-eight billion, one hundred ninety-seven million, three hundred sixteen thousand, nine hundred thirty-nine".