684864409039 has 2 divisors, whose sum is σ = 684864409040. Its totient is φ = 684864409038.

The previous prime is 684864408979. The next prime is 684864409063. The reversal of 684864409039 is 930904468486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684864409039 - 2³⁷ = 547425455567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684864409069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342432204519 + 342432204520.

It is an arithmetic number, because the mean of its divisors is an integer number (342432204520).

Almost surely, 2^684864409039 is an apocalyptic number.

684864409039 is a deficient number, since it is larger than the sum of its proper divisors (1).

684864409039 is an equidigital number, since it uses as much as digits as its factorization.

684864409039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35831808, while the sum is 61.

The spelling of 684864409039 in words is "six hundred eighty-four billion, eight hundred sixty-four million, four hundred nine thousand, thirty-nine".