1681555330099 has 2 divisors, whose sum is σ = 1681555330100. Its totient is φ = 1681555330098.

The previous prime is 1681555330097. The next prime is 1681555330111. The reversal of 1681555330099 is 9900335551861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681555330099 - 2¹ = 1681555330097 is a prime.

Together with 1681555330097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1681555330093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840777665049 + 840777665050.

It is an arithmetic number, because the mean of its divisors is an integer number (840777665050).

Almost surely, 2^{1681555330099} is an apocalyptic number.

1681555330099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681555330099 is an equidigital number, since it uses as much as digits as its factorization.

1681555330099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374000, while the sum is 55.

The spelling of 1681555330099 in words is "one trillion, six hundred eighty-one billion, five hundred fifty-five million, three hundred thirty thousand, ninety-nine".