1684107501809 has 2 divisors, whose sum is σ = 1684107501810. Its totient is φ = 1684107501808.

The previous prime is 1684107501781. The next prime is 1684107501859. The reversal of 1684107501809 is 9081057014861.

It is a happy number.

It is an a-pointer prime, because the next prime (1684107501859) can be obtained adding 1684107501809 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 880266150625 + 803841351184 = 938225^2 + 896572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684107501809 - 2¹² = 1684107497713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1684107501859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842053750904 + 842053750905.

It is an arithmetic number, because the mean of its divisors is an integer number (842053750905).

Almost surely, 2^{1684107501809} is an apocalyptic number.

It is an amenable number.

1684107501809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684107501809 is an equidigital number, since it uses as much as digits as its factorization.

1684107501809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 1684107501809 in words is "one trillion, six hundred eighty-four billion, one hundred seven million, five hundred one thousand, eight hundred nine".