16643421023646 has 16 divisors (see below), whose sum is σ = 33314059430784. Its totient is φ = 5543270777304.

The previous prime is 16643421023633. The next prime is 16643421023731. The reversal of 16643421023646 is 64632012434661.

It is a super-2 number, since 2×16643421023646² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16643421023595 and 16643421023604.

It is a congruent number.

It is an unprimeable number.

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, 1134049696 + ... + 1134064371.

It is an arithmetic number, because the mean of its divisors is an integer number (2082128714424).

Almost surely, 2^{16643421023646} is an apocalyptic number.

16643421023646 is an abundant number, since it is smaller than the sum of its proper divisors (16670638407138).

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

16643421023646 is a wasteful number, since it uses less digits than its factorization.

16643421023646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268115295.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 16643421023646 in words is "sixteen trillion, six hundred forty-three billion, four hundred twenty-one million, twenty-three thousand, six hundred forty-six".