68520487121 has 2 divisors, whose sum is σ = 68520487122. Its totient is φ = 68520487120.

The previous prime is 68520487097. The next prime is 68520487141. The reversal of 68520487121 is 12178402586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48032858896 + 20487628225 = 219164^2 + 143135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68520487121 is a prime.

It is not a weakly prime, because it can be changed into another prime (68520487141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34260243560 + 34260243561.

It is an arithmetic number, because the mean of its divisors is an integer number (34260243561).

Almost surely, 2^68520487121 is an apocalyptic number.

It is an amenable number.

68520487121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68520487121 is an equidigital number, since it uses as much as digits as its factorization.

68520487121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 68520487121 in words is "sixty-eight billion, five hundred twenty million, four hundred eighty-seven thousand, one hundred twenty-one".