1680848621 has 2 divisors, whose sum is σ = 1680848622. Its totient is φ = 1680848620.

The previous prime is 1680848591. The next prime is 1680848627. The reversal of 1680848621 is 1268480861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276275625 + 404572996 = 35725^2 + 20114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680848621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680848627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840424310 + 840424311.

It is an arithmetic number, because the mean of its divisors is an integer number (840424311).

Almost surely, 2^1680848621 is an apocalyptic number.

It is an amenable number.

1680848621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680848621 is an equidigital number, since it uses as much as digits as its factorization.

1680848621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147456, while the sum is 44.

The square root of 1680848621 is about 40998.1538730709. The cubic root of 1680848621 is about 1188.9845210253.

The spelling of 1680848621 in words is "one billion, six hundred eighty million, eight hundred forty-eight thousand, six hundred twenty-one".