16643001344406 has 16 divisors (see below), whose sum is σ = 33528966213744. Its totient is φ = 5507173193984.

The previous prime is 16643001344383. The next prime is 16643001344443. The reversal of 16643001344406 is 60444310034661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10123479315 + ... + 10123480958.

It is an arithmetic number, because the mean of its divisors is an integer number (2095560388359).

Almost surely, 2^{16643001344406} is an apocalyptic number.

16643001344406 is an abundant number, since it is smaller than the sum of its proper divisors (16885964869338).

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

16643001344406 is a wasteful number, since it uses less digits than its factorization.

16643001344406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20246960415.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 16643001344406 in words is "sixteen trillion, six hundred forty-three billion, one million, three hundred forty-four thousand, four hundred six".