68669509 has 2 divisors, whose sum is σ = 68669510. Its totient is φ = 68669508.

The previous prime is 68669473. The next prime is 68669537. The reversal of 68669509 is 90596686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 15233409 = 7310^2 + 3903^2 .

It is a cyclic number.

It is not a de Polignac number, because 68669509 - 2⁹ = 68668997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68669539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34334754 + 34334755.

It is an arithmetic number, because the mean of its divisors is an integer number (34334755).

Almost surely, 2^68669509 is an apocalyptic number.

It is an amenable number.

68669509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68669509 is an equidigital number, since it uses as much as digits as its factorization.

68669509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 68669509 is about 8286.7067644511. The cubic root of 68669509 is about 409.5006989562.

The spelling of 68669509 in words is "sixty-eight million, six hundred sixty-nine thousand, five hundred nine".