16564040150221 has 8 divisors (see below), whose sum is σ = 16677678273984. Its totient is φ = 16450574077440.

The previous prime is 16564040150219. The next prime is 16564040150233. The reversal of 16564040150221 is 12205104046561.

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 16564040150221 - 2¹ = 16564040150219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564040157221) 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, 42819535 + ... + 43204636.

It is an arithmetic number, because the mean of its divisors is an integer number (2084709784248).

Almost surely, 2^{16564040150221} is an apocalyptic number.

It is an amenable number.

16564040150221 is a deficient number, since it is larger than the sum of its proper divisors (113638123763).

16564040150221 is a wasteful number, since it uses less digits than its factorization.

16564040150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86025491.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 16564040150221 its reverse (12205104046561), we get a palindrome (28769144196782).

The spelling of 16564040150221 in words is "sixteen trillion, five hundred sixty-four billion, forty million, one hundred fifty thousand, two hundred twenty-one".