16712116865681 has 4 divisors (see below), whose sum is σ = 16713449689200. Its totient is φ = 16710784042164.

The previous prime is 16712116865603. The next prime is 16712116865749. The reversal of 16712116865681 is 18656861121761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16712116865681 is a prime.

It is a super-2 number, since 2×16712116865681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16712116865681.

It is not an unprimeable number, because it can be changed into a prime (16712116865981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666392951 + ... + 666418028.

It is an arithmetic number, because the mean of its divisors is an integer number (4178362422300).

Almost surely, 2^{16712116865681} is an apocalyptic number.

It is an amenable number.

16712116865681 is a deficient number, since it is larger than the sum of its proper divisors (1332823519).

16712116865681 is a wasteful number, since it uses less digits than its factorization.

16712116865681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332823518.

The product of its digits is 5806080, while the sum is 59.

The spelling of 16712116865681 in words is "sixteen trillion, seven hundred twelve billion, one hundred sixteen million, eight hundred sixty-five thousand, six hundred eighty-one".