1680564737 has 2 divisors, whose sum is σ = 1680564738. Its totient is φ = 1680564736.

The previous prime is 1680564689. The next prime is 1680564779. The reversal of 1680564737 is 7374650861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1618533361 + 62031376 = 40231^2 + 7876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680564737 - 2¹² = 1680560641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680564691 and 1680564700.

It is not a weakly prime, because it can be changed into another prime (1680564337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840282368 + 840282369.

It is an arithmetic number, because the mean of its divisors is an integer number (840282369).

Almost surely, 2^1680564737 is an apocalyptic number.

It is an amenable number.

1680564737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680564737 is an equidigital number, since it uses as much as digits as its factorization.

1680564737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 1680564737 is about 40994.6915709827. The cubic root of 1680564737 is about 1188.9175801000.

The spelling of 1680564737 in words is "one billion, six hundred eighty million, five hundred sixty-four thousand, seven hundred thirty-seven".