16681918346109 has 24 divisors (see below), whose sum is σ = 25514029270080. Its totient is φ = 10466877982848.

The previous prime is 16681918346099. The next prime is 16681918346117. The reversal of 16681918346109 is 90164381918661.

16681918346109 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 1 + 9 + 1 + 8 + 3 + 4 + 610 + 9 = 666.

It is not a de Polignac number, because 16681918346109 - 2⁹ = 16681918345597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681918346129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6827704 + ... + 8943230.

It is an arithmetic number, because the mean of its divisors is an integer number (1063084552920).

Almost surely, 2^{16681918346109} is an apocalyptic number.

It is an amenable number.

16681918346109 is a deficient number, since it is larger than the sum of its proper divisors (8832110923971).

16681918346109 is a wasteful number, since it uses less digits than its factorization.

16681918346109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167089 (or 2167086 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 16681918346109 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-six thousand, one hundred nine".