68317121251 has 4 divisors (see below), whose sum is σ = 68425389904. Its totient is φ = 68208852600.

The previous prime is 68317121207. The next prime is 68317121261. The reversal of 68317121251 is 15212171386.

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 68317121251 - 2¹⁹ = 68316596963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68317121251.

It is not an unprimeable number, because it can be changed into a prime (68317121261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54133380 + ... + 54134641.

It is an arithmetic number, because the mean of its divisors is an integer number (17106347476).

Almost surely, 2^68317121251 is an apocalyptic number.

68317121251 is a deficient number, since it is larger than the sum of its proper divisors (108268653).

68317121251 is a wasteful number, since it uses less digits than its factorization.

68317121251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108268652.

The product of its digits is 20160, while the sum is 37.

The spelling of 68317121251 in words is "sixty-eight billion, three hundred seventeen million, one hundred twenty-one thousand, two hundred fifty-one".