1680505579 has 2 divisors, whose sum is σ = 1680505580. Its totient is φ = 1680505578.

The previous prime is 1680505523. The next prime is 1680505637. The reversal of 1680505579 is 9755050861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680505579 - 2¹⁹ = 1679981291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1680505679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840252789 + 840252790.

It is an arithmetic number, because the mean of its divisors is an integer number (840252790).

Almost surely, 2^1680505579 is an apocalyptic number.

1680505579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680505579 is an equidigital number, since it uses as much as digits as its factorization.

1680505579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 46.

The square root of 1680505579 is about 40993.9700321889. The cubic root of 1680505579 is about 1188.9036294698.

The spelling of 1680505579 in words is "one billion, six hundred eighty million, five hundred five thousand, five hundred seventy-nine".