68720905489 has 2 divisors, whose sum is σ = 68720905490. Its totient is φ = 68720905488.

The previous prime is 68720905439. The next prime is 68720905523. The reversal of 68720905489 is 98450902786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58221829264 + 10499076225 = 241292^2 + 102465^2 .

It is a cyclic number.

It is not a de Polignac number, because 68720905489 - 2¹⁵ = 68720872721 is a prime.

It is not a weakly prime, because it can be changed into another prime (68720905439) 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, 34360452744 + 34360452745.

It is an arithmetic number, because the mean of its divisors is an integer number (34360452745).

Almost surely, 2^68720905489 is an apocalyptic number.

It is an amenable number.

68720905489 is a deficient number, since it is larger than the sum of its proper divisors (1).

68720905489 is an equidigital number, since it uses as much as digits as its factorization.

68720905489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 68720905489 in words is "sixty-eight billion, seven hundred twenty million, nine hundred five thousand, four hundred eighty-nine".