684584520071 has 2 divisors, whose sum is σ = 684584520072. Its totient is φ = 684584520070.

The previous prime is 684584520041. The next prime is 684584520121. The reversal of 684584520071 is 170025485486.

It is an a-pointer prime, because the next prime (684584520121) can be obtained adding 684584520071 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684584520071 - 2⁶ = 684584520007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684584520041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342292260035 + 342292260036.

It is an arithmetic number, because the mean of its divisors is an integer number (342292260036).

Almost surely, 2^684584520071 is an apocalyptic number.

684584520071 is a deficient number, since it is larger than the sum of its proper divisors (1).

684584520071 is an equidigital number, since it uses as much as digits as its factorization.

684584520071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 684584520071 in words is "six hundred eighty-four billion, five hundred eighty-four million, five hundred twenty thousand, seventy-one".