16681918346099 has 2 divisors, whose sum is σ = 16681918346100. Its totient is φ = 16681918346098.

The previous prime is 16681918346087. The next prime is 16681918346117. The reversal of 16681918346099 is 99064381918661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16681918346099 - 2²⁰ = 16681917297523 is a prime.

It is not a weakly prime, because it can be changed into another prime (16681918336099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340959173049 + 8340959173050.

It is an arithmetic number, because the mean of its divisors is an integer number (8340959173050).

Almost surely, 2^{16681918346099} is an apocalyptic number.

16681918346099 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681918346099 is an equidigital number, since it uses as much as digits as its factorization.

16681918346099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120932352, while the sum is 71.

The spelling of 16681918346099 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-six thousand, ninety-nine".