16681918346079 has 64 divisors (see below), whose sum is σ = 25776922149888. Its totient is φ = 9399608064000.

The previous prime is 16681918346021. The next prime is 16681918346081. The reversal of 16681918346079 is 97064381918661.

It is not a de Polignac number, because 16681918346079 - 2⁷ = 16681918345951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681918346099) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1652815557 + ... + 1652825649.

It is an arithmetic number, because the mean of its divisors is an integer number (402764408592).

Almost surely, 2^{16681918346079} is an apocalyptic number.

16681918346079 is a deficient number, since it is larger than the sum of its proper divisors (9095003803809).

16681918346079 is a wasteful number, since it uses less digits than its factorization.

16681918346079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13728.

The product of its (nonzero) digits is 94058496, while the sum is 69.

The spelling of 16681918346079 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-six thousand, seventy-nine".