18646334480421 has 24 divisors (see below), whose sum is σ = 27862650485280. Its totient is φ = 12002104056096.

The previous prime is 18646334480419. The next prime is 18646334480443. The reversal of 18646334480421 is 12408443364681.

18646334480421 is a `hidden beast` number, since 1 + 8 + 64 + 63 + 3 + 4 + 480 + 42 + 1 = 666.

It is not a de Polignac number, because 18646334480421 - 2¹ = 18646334480419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18646334480401) 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 23 ways as a sum of consecutive naturals, for example, 26427006 + ... + 27123408.

It is an arithmetic number, because the mean of its divisors is an integer number (1160943770220).

Almost surely, 2^{18646334480421} is an apocalyptic number.

It is an amenable number.

18646334480421 is a deficient number, since it is larger than the sum of its proper divisors (9216316004859).

18646334480421 is a wasteful number, since it uses less digits than its factorization.

18646334480421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799025 (or 799022 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 54.

The spelling of 18646334480421 in words is "eighteen trillion, six hundred forty-six billion, three hundred thirty-four million, four hundred eighty thousand, four hundred twenty-one".