1680918599 has 2 divisors, whose sum is σ = 1680918600. Its totient is φ = 1680918598.

The previous prime is 1680918587. The next prime is 1680918661. The reversal of 1680918599 is 9958190861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680918599 - 2¹⁶ = 1680853063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680917599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840459299 + 840459300.

It is an arithmetic number, because the mean of its divisors is an integer number (840459300).

Almost surely, 2^1680918599 is an apocalyptic number.

1680918599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680918599 is an equidigital number, since it uses as much as digits as its factorization.

1680918599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 56.

The square root of 1680918599 is about 40999.0072928602. The cubic root of 1680918599 is about 1189.0010209455.

The spelling of 1680918599 in words is "one billion, six hundred eighty million, nine hundred eighteen thousand, five hundred ninety-nine".