16221016591 has 16 divisors (see below), whose sum is σ = 17919699840. Its totient is φ = 14587764480.

The previous prime is 16221016573. The next prime is 16221016649. The reversal of 16221016591 is 19561012261.

It is a happy number.

16221016591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16221016591 - 2¹³ = 16221008399 is a prime.

It is a super-2 number, since 2×16221016591² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221016391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369930 + ... + 411448.

It is an arithmetic number, because the mean of its divisors is an integer number (1119981240).

Almost surely, 2^16221016591 is an apocalyptic number.

16221016591 is a deficient number, since it is larger than the sum of its proper divisors (1698683249).

16221016591 is a wasteful number, since it uses less digits than its factorization.

16221016591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42306.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 16221016591 in words is "sixteen billion, two hundred twenty-one million, sixteen thousand, five hundred ninety-one".