16065830721 has 4 divisors (see below), whose sum is σ = 21421107632. Its totient is φ = 10710553812.

The previous prime is 16065830713. The next prime is 16065830723. The reversal of 16065830721 is 12703856061.

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 not a de Polignac number, because 16065830721 - 2³ = 16065830713 is a prime.

It is a super-2 number, since 2×16065830721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16065830721.

It is not an unprimeable number, because it can be changed into a prime (16065830723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677638451 + ... + 2677638456.

It is an arithmetic number, because the mean of its divisors is an integer number (5355276908).

Almost surely, 2^16065830721 is an apocalyptic number.

It is an amenable number.

16065830721 is a deficient number, since it is larger than the sum of its proper divisors (5355276911).

16065830721 is an equidigital number, since it uses as much as digits as its factorization.

16065830721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355276910.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 16065830721 in words is "sixteen billion, sixty-five million, eight hundred thirty thousand, seven hundred twenty-one".