68018761 has 2 divisors, whose sum is σ = 68018762. Its totient is φ = 68018760.

The previous prime is 68018711. The next prime is 68018779. The reversal of 68018761 is 16781086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67963536 + 55225 = 8244^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 68018761 - 2⁷ = 68018633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68018761.

It is not a weakly prime, because it can be changed into another prime (68018711) 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, 34009380 + 34009381.

It is an arithmetic number, because the mean of its divisors is an integer number (34009381).

Almost surely, 2^68018761 is an apocalyptic number.

It is an amenable number.

68018761 is a deficient number, since it is larger than the sum of its proper divisors (1).

68018761 is an equidigital number, since it uses as much as digits as its factorization.

68018761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 68018761 is about 8247.3487254996. The cubic root of 68018761 is about 408.2030439614.

The spelling of 68018761 in words is "sixty-eight million, eighteen thousand, seven hundred sixty-one".