1680505523 has 2 divisors, whose sum is σ = 1680505524. Its totient is φ = 1680505522.

The previous prime is 1680505493. The next prime is 1680505579. The reversal of 1680505523 is 3255050861.

It is a weak prime.

It is an emirp because it is prime and its reverse (3255050861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680505523 - 2³⁰ = 606763699 is a prime.

It is a super-3 number, since 3×1680505523³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1680505423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840252761 + 840252762.

It is an arithmetic number, because the mean of its divisors is an integer number (840252762).

Almost surely, 2^1680505523 is an apocalyptic number.

1680505523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680505523 is an equidigital number, since it uses as much as digits as its factorization.

1680505523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 1680505523 is about 40993.9693491616. The cubic root of 1680505523 is about 1188.9036162638.

The spelling of 1680505523 in words is "one billion, six hundred eighty million, five hundred five thousand, five hundred twenty-three".