16660326562221 has 8 divisors (see below), whose sum is σ = 22224291623424. Its totient is φ = 11101622937920.

The previous prime is 16660326562211. The next prime is 16660326562247. The reversal of 16660326562221 is 12226562306661.

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 16660326562221 - 2³⁵ = 16625966823853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660326562211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1315351836 + ... + 1315364501.

It is an arithmetic number, because the mean of its divisors is an integer number (2778036452928).

Almost surely, 2^{16660326562221} is an apocalyptic number.

It is an amenable number.

16660326562221 is a deficient number, since it is larger than the sum of its proper divisors (5563965061203).

16660326562221 is a wasteful number, since it uses less digits than its factorization.

16660326562221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630718451.

The product of its (nonzero) digits is 1866240, while the sum is 48.

Adding to 16660326562221 its reverse (12226562306661), we get a palindrome (28886888868882).

The spelling of 16660326562221 in words is "sixteen trillion, six hundred sixty billion, three hundred twenty-six million, five hundred sixty-two thousand, two hundred twenty-one".