68721659 has 2 divisors, whose sum is σ = 68721660. Its totient is φ = 68721658.

The previous prime is 68721649. The next prime is 68721671. The reversal of 68721659 is 95612786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68721659 - 2¹⁶ = 68656123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68721629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360829 + 34360830.

It is an arithmetic number, because the mean of its divisors is an integer number (34360830).

Almost surely, 2^68721659 is an apocalyptic number.

68721659 is a deficient number, since it is larger than the sum of its proper divisors (1).

68721659 is an equidigital number, since it uses as much as digits as its factorization.

68721659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 68721659 is about 8289.8527731197. The cubic root of 68721659 is about 409.6043357231.

The spelling of 68721659 in words is "sixty-eight million, seven hundred twenty-one thousand, six hundred fifty-nine".