68928217159 has 4 divisors (see below), whose sum is σ = 68931027000. Its totient is φ = 68925407320.

The previous prime is 68928217151. The next prime is 68928217177. The reversal of 68928217159 is 95171282986.

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

It is a cyclic number.

It is not a de Polignac number, because 68928217159 - 2³ = 68928217151 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68928217151) 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, 1367797 + ... + 1417294.

It is an arithmetic number, because the mean of its divisors is an integer number (17232756750).

Almost surely, 2^68928217159 is an apocalyptic number.

68928217159 is a deficient number, since it is larger than the sum of its proper divisors (2809841).

68928217159 is a wasteful number, since it uses less digits than its factorization.

68928217159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809840.

The product of its digits is 4354560, while the sum is 58.

The spelling of 68928217159 in words is "sixty-eight billion, nine hundred twenty-eight million, two hundred seventeen thousand, one hundred fifty-nine".