1688680673 has 2 divisors, whose sum is σ = 1688680674. Its totient is φ = 1688680672.

The previous prime is 1688680627. The next prime is 1688680687. The reversal of 1688680673 is 3760868861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1673873569 + 14807104 = 40913^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688680673 - 2⁸ = 1688680417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688620673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844340336 + 844340337.

It is an arithmetic number, because the mean of its divisors is an integer number (844340337).

Almost surely, 2^1688680673 is an apocalyptic number.

It is an amenable number.

1688680673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688680673 is an equidigital number, since it uses as much as digits as its factorization.

1688680673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 1688680673 is about 41093.5599942375. The cubic root of 1688680673 is about 1190.8283837364.

The spelling of 1688680673 in words is "one billion, six hundred eighty-eight million, six hundred eighty thousand, six hundred seventy-three".