68240561 has 2 divisors, whose sum is σ = 68240562. Its totient is φ = 68240560.

The previous prime is 68240507. The next prime is 68240581. The reversal of 68240561 is 16504286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 13184161 = 7420^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 68240561 - 2¹⁰ = 68239537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68240581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34120280 + 34120281.

It is an arithmetic number, because the mean of its divisors is an integer number (34120281).

Almost surely, 2^68240561 is an apocalyptic number.

It is an amenable number.

68240561 is a deficient number, since it is larger than the sum of its proper divisors (1).

68240561 is an equidigital number, since it uses as much as digits as its factorization.

68240561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 68240561 is about 8260.7845269078. The cubic root of 68240561 is about 408.6462608985.

The spelling of 68240561 in words is "sixty-eight million, two hundred forty thousand, five hundred sixty-one".