684866959668487 has 2 divisors, whose sum is σ = 684866959668488. Its totient is φ = 684866959668486.

The previous prime is 684866959668461. The next prime is 684866959668601. The reversal of 684866959668487 is 784866959668486.

684866959668487 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 is a cyclic number.

It is not a de Polignac number, because 684866959668487 - 2³⁵ = 684832599930119 is a prime.

It is a pancake number, because a pancake can be divided into 684866959668487 parts by 37009916 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 684866959668392 and 684866959668401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684866959668887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342433479834243 + 342433479834244.

It is an arithmetic number, because the mean of its divisors is an integer number (342433479834244).

Almost surely, 2^{684866959668487} is an apocalyptic number.

684866959668487 is a deficient number, since it is larger than the sum of its proper divisors (1).

684866959668487 is an equidigital number, since it uses as much as digits as its factorization.

684866959668487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1444738498560, while the sum is 100.

Subtracting 684866959668487 from its reverse (784866959668486), we obtain a palindrome (99999999999999).

The spelling of 684866959668487 in words is "six hundred eighty-four trillion, eight hundred sixty-six billion, nine hundred fifty-nine million, six hundred sixty-eight thousand, four hundred eighty-seven".