16442731567721 has 8 divisors (see below), whose sum is σ = 16536201830400. Its totient is φ = 16349338208160.

The previous prime is 16442731567697. The next prime is 16442731567811. The reversal of 16442731567721 is 12776513724461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16442731567721 - 2³⁰ = 16441657825897 is a prime.

It is a super-3 number, since 3×16442731567721³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16442731567021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18796916 + ... + 19652213.

It is an arithmetic number, because the mean of its divisors is an integer number (2067025228800).

Almost surely, 2^{16442731567721} is an apocalyptic number.

It is an amenable number.

16442731567721 is a deficient number, since it is larger than the sum of its proper divisors (93470262679).

16442731567721 is a wasteful number, since it uses less digits than its factorization.

16442731567721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38451559.

The product of its digits is 11854080, while the sum is 56.

The spelling of 16442731567721 in words is "sixteen trillion, four hundred forty-two billion, seven hundred thirty-one million, five hundred sixty-seven thousand, seven hundred twenty-one".