1680641593 has 2 divisors, whose sum is σ = 1680641594. Its totient is φ = 1680641592.

The previous prime is 1680641591. The next prime is 1680641597. The reversal of 1680641593 is 3951460861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1421817849 + 258823744 = 37707^2 + 16088^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680641593 - 2¹ = 1680641591 is a prime.

Together with 1680641591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1680641591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840320796 + 840320797.

It is an arithmetic number, because the mean of its divisors is an integer number (840320797).

Almost surely, 2^1680641593 is an apocalyptic number.

It is an amenable number.

1680641593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680641593 is an equidigital number, since it uses as much as digits as its factorization.

1680641593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1680641593 is about 40995.6289499259. The cubic root of 1680641593 is about 1188.9357037808.

The spelling of 1680641593 in words is "one billion, six hundred eighty million, six hundred forty-one thousand, five hundred ninety-three".