68720555287 has 2 divisors, whose sum is σ = 68720555288. Its totient is φ = 68720555286.

The previous prime is 68720555279. The next prime is 68720555297. The reversal of 68720555287 is 78255502786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68720555287 - 2³ = 68720555279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68720555227) 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, 34360277643 + 34360277644.

It is an arithmetic number, because the mean of its divisors is an integer number (34360277644).

Almost surely, 2^68720555287 is an apocalyptic number.

68720555287 is a deficient number, since it is larger than the sum of its proper divisors (1).

68720555287 is an equidigital number, since it uses as much as digits as its factorization.

68720555287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408000, while the sum is 55.

The spelling of 68720555287 in words is "sixty-eight billion, seven hundred twenty million, five hundred fifty-five thousand, two hundred eighty-seven".