684838433689 has 2 divisors, whose sum is σ = 684838433690. Its totient is φ = 684838433688.

The previous prime is 684838433639. The next prime is 684838433701. The reversal of 684838433689 is 986334838486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659871905625 + 24966528064 = 812325^2 + 158008^2 .

It is a cyclic number.

It is not a de Polignac number, because 684838433689 - 2¹³ = 684838425497 is a prime.

It is not a weakly prime, because it can be changed into another prime (684838433639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342419216844 + 342419216845.

It is an arithmetic number, because the mean of its divisors is an integer number (342419216845).

Almost surely, 2^684838433689 is an apocalyptic number.

It is an amenable number.

684838433689 is a deficient number, since it is larger than the sum of its proper divisors (1).

684838433689 is an equidigital number, since it uses as much as digits as its factorization.

684838433689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 573308928, while the sum is 70.

The spelling of 684838433689 in words is "six hundred eighty-four billion, eight hundred thirty-eight million, four hundred thirty-three thousand, six hundred eighty-nine".