68721520459 has 2 divisors, whose sum is σ = 68721520460. Its totient is φ = 68721520458.

The previous prime is 68721520421. The next prime is 68721520481. The reversal of 68721520459 is 95402512786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68721520459 - 2¹⁹ = 68720996171 is a prime.

It is not a weakly prime, because it can be changed into another prime (68721523459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360760229 + 34360760230.

It is an arithmetic number, because the mean of its divisors is an integer number (34360760230).

Almost surely, 2^68721520459 is an apocalyptic number.

68721520459 is a deficient number, since it is larger than the sum of its proper divisors (1).

68721520459 is an equidigital number, since it uses as much as digits as its factorization.

68721520459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 68721520459 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred twenty thousand, four hundred fifty-nine".