1680510691 has 2 divisors, whose sum is σ = 1680510692. Its totient is φ = 1680510690.

The previous prime is 1680510679. The next prime is 1680510719. The reversal of 1680510691 is 1960150861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680510691 - 2⁹ = 1680510179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680510691.

It is not a weakly prime, because it can be changed into another prime (1680510631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840255345 + 840255346.

It is an arithmetic number, because the mean of its divisors is an integer number (840255346).

Almost surely, 2^1680510691 is an apocalyptic number.

1680510691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680510691 is an equidigital number, since it uses as much as digits as its factorization.

1680510691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1680510691 is about 40994.0323827749. The cubic root of 1680510691 is about 1188.9048349938.

The spelling of 1680510691 in words is "one billion, six hundred eighty million, five hundred ten thousand, six hundred ninety-one".