1686728011099 has 2 divisors, whose sum is σ = 1686728011100. Its totient is φ = 1686728011098.

The previous prime is 1686728011097. The next prime is 1686728011123. The reversal of 1686728011099 is 9901108276861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1686728011099 - 2¹ = 1686728011097 is a prime.

Together with 1686728011097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1686728011097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843364005549 + 843364005550.

It is an arithmetic number, because the mean of its divisors is an integer number (843364005550).

Almost surely, 2^{1686728011099} is an apocalyptic number.

1686728011099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686728011099 is an equidigital number, since it uses as much as digits as its factorization.

1686728011099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 1686728011099 in words is "one trillion, six hundred eighty-six billion, seven hundred twenty-eight million, eleven thousand, ninety-nine".