68721519371 has 2 divisors, whose sum is σ = 68721519372. Its totient is φ = 68721519370.

The previous prime is 68721519331. The next prime is 68721519409. The reversal of 68721519371 is 17391512786.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68721519371 - 2¹⁰ = 68721518347 is a prime.

It is not a weakly prime, because it can be changed into another prime (68721519301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360759685 + 34360759686.

It is an arithmetic number, because the mean of its divisors is an integer number (34360759686).

Almost surely, 2^68721519371 is an apocalyptic number.

68721519371 is a deficient number, since it is larger than the sum of its proper divisors (1).

68721519371 is an equidigital number, since it uses as much as digits as its factorization.

68721519371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The spelling of 68721519371 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred nineteen thousand, three hundred seventy-one".