68497320917 has 4 divisors (see below), whose sum is σ = 68497927116. Its totient is φ = 68496714720.

The previous prime is 68497320911. The next prime is 68497321073. The reversal of 68497320917 is 71902379486.

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 2 ways, for example, as 45607446481 + 22889874436 = 213559^2 + 151294^2 .

It is a cyclic number.

It is not a de Polignac number, because 68497320917 - 2¹⁰ = 68497319893 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 (68497320911) 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, 77768 + ... + 378209.

It is an arithmetic number, because the mean of its divisors is an integer number (17124481779).

Almost surely, 2^68497320917 is an apocalyptic number.

It is an amenable number.

68497320917 is a deficient number, since it is larger than the sum of its proper divisors (606199).

68497320917 is a wasteful number, since it uses less digits than its factorization.

68497320917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606198.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 68497320917 in words is "sixty-eight billion, four hundred ninety-seven million, three hundred twenty thousand, nine hundred seventeen".