684145585541489 has 2 divisors, whose sum is σ = 684145585541490. Its totient is φ = 684145585541488.

The previous prime is 684145585541471. The next prime is 684145585541521. The reversal of 684145585541489 is 984145585541486.

684145585541489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449634340203889 + 234511245337600 = 21204583^2 + 15313760^2 .

It is a cyclic number.

It is not a de Polignac number, because 684145585541489 - 2²⁰ = 684145584492913 is a prime.

It is not a weakly prime, because it can be changed into another prime (684145585571489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342072792770744 + 342072792770745.

It is an arithmetic number, because the mean of its divisors is an integer number (342072792770745).

Almost surely, 2^{684145585541489} is an apocalyptic number.

It is an amenable number.

684145585541489 is a deficient number, since it is larger than the sum of its proper divisors (1).

684145585541489 is an equidigital number, since it uses as much as digits as its factorization.

684145585541489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4423680000, while the sum is 77.

The spelling of 684145585541489 in words is "six hundred eighty-four trillion, one hundred forty-five billion, five hundred eighty-five million, five hundred forty-one thousand, four hundred eighty-nine".