1680168871 has 4 divisors (see below), whose sum is σ = 1779002352. Its totient is φ = 1581335392.

The previous prime is 1680168827. The next prime is 1680168923. The reversal of 1680168871 is 1788610861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1788610861 = 227 ⋅7879343.

It is a cyclic number.

It is not a de Polignac number, because 1680168871 - 2¹⁹ = 1679644583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680168671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49416715 + ... + 49416748.

It is an arithmetic number, because the mean of its divisors is an integer number (444750588).

Almost surely, 2^1680168871 is an apocalyptic number.

1680168871 is a deficient number, since it is larger than the sum of its proper divisors (98833481).

1680168871 is an equidigital number, since it uses as much as digits as its factorization.

1680168871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98833480.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1680168871 is about 40989.8630273388. The cubic root of 1680168871 is about 1188.8242208071.

The spelling of 1680168871 in words is "one billion, six hundred eighty million, one hundred sixty-eight thousand, eight hundred seventy-one".