16660371621204 has 36 divisors (see below), whose sum is σ = 42235082364384. Its totient is φ = 5537453003472.

The previous prime is 16660371621199. The next prime is 16660371621209. The reversal of 16660371621204 is 40212617306661.

It is an interprime number because it is at equal distance from previous prime (16660371621199) and next prime (16660371621209).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16660371621204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660371621209) 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 11 ways as a sum of consecutive naturals, for example, 666829152 + ... + 666854135.

It is an arithmetic number, because the mean of its divisors is an integer number (1173196732344).

Almost surely, 2^{16660371621204} is an apocalyptic number.

It is an amenable number.

16660371621204 is an abundant number, since it is smaller than the sum of its proper divisors (25574710743180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16660371621204 is a wasteful number, since it uses less digits than its factorization.

16660371621204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333683644 (or 1333683639 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

Adding to 16660371621204 its reverse (40212617306661), we get a palindrome (56872988927865).

The spelling of 16660371621204 in words is "sixteen trillion, six hundred sixty billion, three hundred seventy-one million, six hundred twenty-one thousand, two hundred four".