68495809 has 2 divisors, whose sum is σ = 68495810. Its totient is φ = 68495808.

The previous prime is 68495807. The next prime is 68495831. The reversal of 68495809 is 90859486.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49660209 + 18835600 = 7047^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 68495809 - 2¹ = 68495807 is a prime.

Together with 68495807, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68495807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34247904 + 34247905.

It is an arithmetic number, because the mean of its divisors is an integer number (34247905).

Almost surely, 2^68495809 is an apocalyptic number.

It is an amenable number.

68495809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68495809 is an equidigital number, since it uses as much as digits as its factorization.

68495809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 68495809 is about 8276.2194871813. The cubic root of 68495809 is about 409.1551291309.

The spelling of 68495809 in words is "sixty-eight million, four hundred ninety-five thousand, eight hundred nine".