1680338617 has 2 divisors, whose sum is σ = 1680338618. Its totient is φ = 1680338616.

The previous prime is 1680338579. The next prime is 1680338657. The reversal of 1680338617 is 7168330861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197921321 + 482417296 = 34611^2 + 21964^2 .

It is an emirp because it is prime and its reverse (7168330861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680338617 - 2²⁷ = 1546120889 is a prime.

It is a super-3 number, since 3×1680338617³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1680338657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840169308 + 840169309.

It is an arithmetic number, because the mean of its divisors is an integer number (840169309).

Almost surely, 2^1680338617 is an apocalyptic number.

It is an amenable number.

1680338617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680338617 is an equidigital number, since it uses as much as digits as its factorization.

1680338617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1680338617 is about 40991.9335601530. The cubic root of 1680338617 is about 1188.8642547514.

The spelling of 1680338617 in words is "one billion, six hundred eighty million, three hundred thirty-eight thousand, six hundred seventeen".