16444273165621 has 24 divisors (see below), whose sum is σ = 20116378789056. Its totient is φ = 13164701122560.

The previous prime is 16444273165559. The next prime is 16444273165717. The reversal of 16444273165621 is 12656137244461.

It is not a de Polignac number, because 16444273165621 - 2¹¹ = 16444273163573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16444273145621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30760396 + ... + 31290421.

It is an arithmetic number, because the mean of its divisors is an integer number (838182449544).

Almost surely, 2^{16444273165621} is an apocalyptic number.

It is an amenable number.

16444273165621 is a deficient number, since it is larger than the sum of its proper divisors (3672105623435).

16444273165621 is a wasteful number, since it uses less digits than its factorization.

16444273165621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62050989 (or 62050972 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 52.

The spelling of 16444273165621 in words is "sixteen trillion, four hundred forty-four billion, two hundred seventy-three million, one hundred sixty-five thousand, six hundred twenty-one".